Network technologies and trends


July 5, 2008  6:35 AM

Sample I.T Security Policy – Data Security

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

As we are proceeding ahead, and we have two more topics to be covered to complete this Sample I.T Security Policy, hope fully it will be good and useful to you all. I would like to have some comments which may boost my morale to take up more interesting things in future. Here we are with Data Security.

DATA SECURITY

“IS” CONSIDERED THE FOLLOWING:

1. Create a strong backup & Disaster recovery strategy and test backups regularly.
2. Create separate partitions for the Windows System files and the volume the server will share. Then don’t share the system boot partition, share only the empty volume created for file storage.
3. Implement strong permission-based security for all files stored on the server.
4. Never use the FAT file system on the hard disk of a Windows computer when security is a concern.
5. Remove default assignments to the everyone group.
6. Repair damaged drives in mirror or stripe sets as soon as possible.
7. Store backup tapes in a waterproof, flameproof safe in the server room. If tapes must be moved off site, be certain security measures are in place to prevent their being compromised while off site.
8. Use disk mirroring or duplexing for critical data. Use duplexing when possible.
9. Consider using hardware RAID, which is faster and is independent of the operating system.
10. Consider using SAN for huge amount of data.
11. If the server’s physical security could be compromised in any way, and the data on the disk warrants protection, use file system encryption.
12. Use file system encryption to protect sensitive data when operating system features are not effective (when the hard drive has been removed or the operating system has been replaced).
13. For extreme fault tolerance, consider using a third -party server replication system.
14. Access to information and documents is to be carefully controlled; ensuring that only authorized personnel may have access to sensitive information.
15. With poor or inadequate access control over your documents and files, information may be copied or modified by unauthorized persons, or become corrupted unintentionally or maliciously.
16. High risk systems require more stringent access control safeguards due to the confidentiality of the information that process and / or the purpose of the system e.g. the funds transfer used by banks. Ideally, the operating systems for such systems should be hardened for further enhance security.
17. Properly mark proprietary and confidential documents. The confidential markings can be minimized if they are seen on routine documents. Mark only proprietary documents, not everything.
18. Track printouts from any computer. Have confidential and proprietary markings automatically put on every printed proprietary document.
19. Limit access to source code; limit physical access to documents.
20. Access to data and information is at the heart of every set of Information Security Policies. Inappropriate access to data may contravene Organization policy and infringe legal regulations.
21. The right to access systems and data is based upon identified and approved business needs and should be withdrawn when the need ceases.
22. Denying unauthorized person’s access, both physical and logical, to the Organist ion systems is part of an effective Information Security process. Physical access to the data centre or computer room’ should always be restricted to authorized persons only.
23. However, data access goes beyond access to PCs and servers; it also includes access to written and printed information on the desks of personnel, notes pinned to notice boards etc. Access to such information must also be controlled. Traditionally, door locks and keys ensured security; nowadays, even greater security can be provided by electronic keys, biometrics with the additional benefit that they may also monitor and record access attempts.
24. Where user’s access rights and privileges are not documented, information security may be compromised.

Yasir
Personel Website:www.yasirirfan.com

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July 1, 2008  11:20 AM

Cisco Cool tips- Series 4 -Show modules

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Here is one more cool command which shows a summary of modules installed in a Cisco 6500 Switch.

MBGF-DAC-6500-BB02#sho modules
Mod Ports Card Type Model Serial No.
— —– ————————————– —————— ———–
3 24 CEF720 24 port 1000mb SFP WS-X6724-SFP SAL0828061N
4 24 CEF720 24 port 1000mb SFP WS-X6724-SFP SAL10478H52
7 2 Supervisor Engine 720 (Active) WS-SUP720-3B SAD083208MN

Mod MAC addresses Hw Fw Sw Status
— ———————————- —— ———— ———— ——-
3 0011.5cce.ff54 to 0011.5cce.ff6b 2.1 12.2(14r)S5 12.2(18)SXD7 Ok
4 0018.bab0.4a94 to 0018.bab0.4aab 2.5 12.2(14r)S5 12.2(18)SXD7 Ok
7 0011.21ba.4d58 to 0011.21ba.4d5b 4.0 8.1(3) 12.2(18)SXD7 Ok

Mod Sub-Module Model Serial Hw Status
— ————————— —————— ———— ——- ——-
3 Centralized Forwarding Card WS-F6700-CFC SAD0816031H 2.0 Ok
4 Centralized Forwarding Card WS-F6700-CFC SAL10478F23 2.1 Ok
7 Policy Feature Card 3 WS-F6K-PFC3B SAD08300ACJ 1.0 Ok
7 MSFC3 Daughterboard WS-SUP720 SAD08300GY0 2.1 Ok

Mod Online Diag Status
— ——————-
3 Pass
4 Pass
7 Pass
MBGF-DAC-6500-BB02#

Yasir
Personel:www.yasirirfan.com

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July 1, 2008  7:25 AM

New CCNA Certifications– CCNA Voice, CCNA Security & CCNA Wireless

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

As the network trends are changing so does Cisco, they came up with three new certifications. The hot new areas for CCNA Certifications are Voice, Security and Wireless. Intorduction of these three certifications can assure and help you to verify the specialized skills that are great demand among employers.

cc-pyramid.gif
Logo courtesy (Cisco)
A CCNA Voice sertifcations helps to prepare for the jobs such as voice administartorm voice engineer. It gives terrific exposer to unified communication applications and architectures.

The CCNA Security certification prepares you for jobs such as network security specialist, security administrator, and network security support engineer. This certification verifies your ability to manage security devices, implement security policies, and mitigate risks.

CCNA Wireless recognizes the critical importance of professionals supporting wireless LANS including Networking Associates/Administrators, Wireless Support Specialists and WLAN project managers.

Cisco press rerecelty released the study guides for these new certifications. For further details about these study guides access the following link Cisco Press Books

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July 1, 2008  7:25 AM

Sample I.T Securty Policy – Server Security

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Now we are proceeding towards the Server Security Policy, which was quite tiresome to draft.

6‐SERVER SECURITY
“IS” CONSIDERED THE FOLLOWING:
1. Limit the number of protocols in use throughout the network to the extent possible.
2. Use connection-monitoring software like the performance monitor to alert the network administrator to potential intrusion attempts.
3. Antivirus software must be chosen from a proven leading supplier
4. Remove the keyboard and monitor from servers if possible. They can be reattached when administration is necessary. Certain mouse devices will not reset properly when reattached; they should be left attached.
5. Add trust relationships between domains only when several users need access.
6. Create groups based on natural associations in the Dept. Assign file permissions by groups. Make user accounts members of the groups that need access to certain files.
7. Don’t allow unrestricted file sharing. Use files sharing with user-based authentication or, at the very least, passwords.
8. Limit the rights of Guest and Anonymous accounts.
9. Never enable the Guest account.
10. Try to arrange data so that as few user accounts as possible are required for users to access it.
11. Do not make Internet Information Server user accounts members of the Users or Domain Users groups. A void making these accounts members of groups that would grant these users additional rights or access permissions.
12. Do not make script virtual directories readable, do not make other virtual directories executable.
13. Create a group for Internet users for lIS; apply permissions to that group account.
14. Do not allow users to place scripts in their own WWW service virtual directories.
15. Use the logging facilities of lIS to watch for a high proportion of unauthorized, forbidden, and not found access attempts.
16. Do not allow NetBIOS connections to be made over the Internet.
17. Replace the default Everyone, Full Control permission with a Domain Users, Change permission on all drives except the system and boot volumes.
18. On each Window 2003 server inside the network, establish filters to pass only those protocols that are explicitly served. This prevents software from working in unexpected ways.
19. To make administration easier and leave less possibility for error, use several shares on one workstation rather than scattering them among several workstations, if possible.
20. Use the No Access permission only then necessary to override other permitted access.
21. Grant permissions for a share to a specific group or set of users, rather than using the everyone group and attempting to restrict users at the subdirectory level.
22. Use NTFS volumes for file sharing whenever possible, and use file-level security rather than share-level security when possible.
23. Keep sensitive information out of the shopper table because that information is accessible to a web browser.
24. Use both a secure port (HTTPS) and Secure Socket Layer encryption, and use strong NTFS permissions restrictions on WWW service virtual directories.
25. Require all possible network connections to services outside the network security to go through a proxy server.
26. Configure the DNS server to exchange information with only computers within the network security and with the DNS server “up” the network tree from them.
27. Remove all instances of the Everyone, Full Control permission. Do not set a default permission to replace it so that all subdirectories from the root do not by default inherit permissions. Add permissions only where specifically required.
28. Access to operating systems is to be restricted to those persons who are authorized to perform systems administration/management functions. Even then such access must be operated under dual control requiring the specific approval of senior management.
29. Staff with access to the $ prompt or command line, could succeed in executing system command,which could damage and corrupt your system and data.
30. Operating System commands could be used to disable or circumvent access control and audit log facilities, etc System access must be monitored regularly to prevent attempts at unauthorized access and to confirm that access control standards are effective.
31. Apply intrusion detection sensor for each server you want to protect.
32. Make sure the audit or accounting functions are turned on.
33. Keep try to find the last patches found for both the Operating systems and applications installed on that servers .That will help for closed O.S and Application holes.
34. Have servers in a physically secure location to prevent unauthorized access.
35. On a regular basis, run programs (for example, Crack, Tiger, COPS and Satan) to check for system weaknesses.
36. Make timely system backups.
37. Keep one copy of backup tapes in a secure facility offsite.
38. Use a virus-checker program.
39. Modify registry in windows severs for maximum security issues according to Microsoft security check list.

Yasir
Personel Website:www.yasirirfan.com

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June 30, 2008  6:28 AM

Good Bye CCNA Prep Center. CCNP Prep Center

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Do you know Cisco is closing the CNNA Prep Center,CCNP Prep Center, Certifications Community Site and the Cisco Learning Connection sites and will not be accessible after July 25, 2008. They came up with a new portal known as Cisco Learning Network which has lot of resources, which are helpful to achieve CCNA,CCNP and much more. Wow what a commitment from Cisco.You can access the new site by following this link Cisco Learning Network.


June 28, 2008  12:25 PM

How to configure ASA/PIX firewall to collect Net flow data from an external router to the netflow collector located in Inside Network.

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

This article provides an example of Net flow configurations in a Cisco Router, ASA/PIX firewall to collect the Net flow data in the internal network.
netflow1.jpg
Components Uses
The information in this document is based on following hardware and software versions
• Cisco Router 3745 – IOS version 12.3(17b. (Network 192.168.10.0)
• PIX 525 7.0.3 ( ASA can also be used) (Internal 10.0.0.2)
• Manage Engine Net flow Analyzer 6 ( Any net flow collector can be used)(

In this example let’s start by configuring Net flow in a Cisco Router

Cisco Router Configuration
Here the IP address for the interface is 192.168.10.1

Enabling Net flow in an Interface
Enter global configuration mode on the router and issue the following commands for each interface on which you want to enable Net Flow:

interface {interface} {interface_number}
ip route-cache flow
bandwidth
exit

After applying the commands the example will be as follows
router3745#configure terminal
router-3745(config)#interface FastEthernet 0/1
router-3745(config)#ip address 192.198.10.1 255.255.255.240
router-3745(config-if)#ip route-cache flow
router-3745(config-if)Bandwidth 1000
router-3745(config-if)#exit

Exporting NetFlow Data

Issue the following commands to export Net Flow data to the server on which NetFlow Analyzer is running:

ip flow-export destination {hostname|ip_address} 9996 ( Exports the NetFlow cache entries to the specified IP address. Use the IP address of the NetFlow Analyzer server and the configured NetFlow listener port. The default port is 9996. )

ip flow-export source {interface} {interface_number} (Sets the source IP address of the NetFlow exports sent by the device to the specified IP address. NetFlow Analyzer will make SNMP requests of the device on this address.)

ip flow-export version 5 [peer-as | origin-as] (Sets the NetFlow export version to version 5. Version 5,7 & 9 are available)

ip flow-cache timeout active 1 (Breaks up long-lived flows into 1-minute fragments. You can choose any number of minutes between 1 and 60. If you leave it at the default of 30 minutes your traffic reports will have spikes.It is important to set this value to 1 minute in order to generate alerts and view troubleshooting data.)

ip flow-cache timeout inactive 15 (Ensures that flows that have finished are periodically exported. The default value is 15 seconds. You can choose any number of seconds between 10 and 600. )

snmp-server ifindex persist (Enables ifIndex persistence (interface names) globally. This ensures that the ifIndex values are persisted during device reboots.)

The following example shows the above mentioned commands

router-3745(config)#ip flow-export destination 192.168.10.5 9996
router-3745(config)#ip flow-export source FastEthernet 0/1
router-3745(config)#ip flow-export version 5
router-3745(config)#ip flow-cache timeout active 1
router-3745(config)#ip flow-cache timeout inactive 15
router-3745(config)#snmp-server ifindex persist
router-3745(config)#^Z

Issue the following commands in normal (not configuration) mode to verify whether NetFlow export has been configured correctly:

show ip flow export (Shows the current NetFlow configuration)
show ip cache flow (These commands summarize the active flows and give an indication of how much NetFlow data the device is exporting

router-3745#show ip flow export
router-3745#show ip cache flow

The next step is make a Natting in ASA/PIX

pix-525# configure t
pix-525# (config)# static (inside,outside) 192.168.10.5 10.0.0.6 netmask 255.255.255.255 dns

In order to export to the netflow statistics to the netflow analyzer located in the internal network we have configure the following access-list and apply it to outside interface to allow the Netflow traffic

pix-525# configure t
pix-525# (config)#access-list NETFLOW extended permit udp any host 192.168.10.5 eq 9996
pix-525# (config)#access-list NETFLOW extended permit tcp any any

Apply the created access-list to the outside interface
pix-525# (config)#access-group NETFLOW in interface outside

Now install the Netflow Analyzer software and configure it to recieve the netflow statists from the external router.

Troubleshooting tips

Verify Netflow is working in Cisco Router

router-3745#sho ip cache flow
IP packet size distribution (78841980 total packets):
1-32 64 96 128 160 192 224 256 288 320 352 384 416 448 480
.003 .453 .023 .012 .008 .010 .004 .003 .003 .003 .004 .003 .003 .003 .004

512 544 576 1024 1536 2048 2560 3072 3584 4096 4608
.003 .005 .022 .021 .401 .000 .000 .000 .000 .000 .000

IP Flow Switching Cache, 278544 bytes
548 active, 3548 inactive, 4045717 added
84147818 ager polls, 0 flow alloc failures
Active flows timeout in 1 minutes
Inactive flows timeout in 15 seconds
IP Sub Flow Cache, 33416 bytes
548 active, 1500 inactive, 4045717 added, 4045717 added to flow
0 alloc failures, 0 force free
2 chunks, 14 chunks added
last clearing of statistics never
Protocol Total Flows Packets Bytes Packets Active(Sec) Idle(Sec)
——– Flows /Sec /Flow /Pkt /Sec /Flow /Flow
TCP-Telnet 143 0.0 2 52 0.0 0.4 12.7
TCP-FTP 255 0.0 6 100 0.0 9.0 7.2
TCP-FTPD 15010 0.0 1 63 0.0 0.6 15.4
TCP-WWW 1100665 2.5 14 607 37.7 8.2 6.9
TCP-SMTP 171448 0.3 69 633 27.3 35.8 6.2
TCP-X 723 0.0 2 245 0.0 0.4 13.0
TCP-other 1966270 4.5 21 656 95.4 11.7 6.6
UDP-DNS 56825 0.1 12 66 1.5 20.5 11.6
UDP-NTP 8 0.0 1 76 0.0 0.0 15.5
UDP-Frag 1 0.0 1 1476 0.0 0.0 15.0
UDP-other 684203 1.5 11 319 17.9 4.8 14.9
ICMP 48198 0.1 1 78 0.2 1.6 15.4
GRE 1358 0.0 183 182 0.5 50.0 4.2
IP-other 62 0.0 83 108 0.0 53.4 3.2
Total: 4045169 9.2 19 601 180.9 10.6 8.3

SrcIf SrcIPaddress DstIf DstIPaddress Pr SrcP DstP Pkts
Fa0/1 192.168.10.5 Tu0 69.26.190.118 11 1705 0D96 8
Fa0/1 192.168.10.5 Tu0 65.55.111.92 06 0019 10EC 32
Fa0/1 192.168.10.5 Tu0 206.190.48.113 06 0019 714B 29

Check Nating is working in the Firewall

pix-525# show xlate
2in use, 417 most used
Global 192.168.10.5 Local 10.0.0.6

Check access -list is forwading the netflow traffic

pix-525# sho access-list NETFLOW
access-list NETFLOW; 2 elements
access-list NETFLOW line 1 extended permit udp any host 192.168.10.5 eq 9996 (hitcnt=7)
access-list NETFLOW line 2 extended permit ip any any (hitcnt=140861)

To know more about Netflow Analyzer and its configuration click this link Netflow.

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June 28, 2008  5:24 AM

Sample I.T Secuirty – Network Security

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

We are continuing our series on Sample I.T Security Policy, so far we have covered Physical, Human, User Secuity and Client. Today lets concentrate on Network security which is as follows

5‐NETWORK SECURITY
“IS” CONSIDERED THE FOLLOWING:
1. The network must be designed and configured to deliver high performance and reliability to meet the needs of business whilst providing a high degree of access control and range of privilege restrictions.
2. Inappropriate control over access to the network will threaten the confidentiality and integrity of Organisation data.
3. Apply Strong monitor and management utilities in Organisation network.
4. Never communicate between Organisation units over the Internet without using some form of encryption.Unencrypted packet headers contain valuable nuggets of information about the structure of the internal network.
5. Always use encrypted communications for data that flows over public networks like the Internet.
6. Locally control and administer all security services for the network.
7. Make telecommunications security an integral part of the network security if the network can be accessed via modems.
8. Use leased lines rather than encrypted tunnels whenever practical.
9. Monitor and Audit the logs for the internal routers and switches.
10. Install fiber cables instead of UTP cables.
11. All speed dialing facility create information security risks as confidential customer contact information can be accesses just by pressing telephone keys.

I.S issues concerned:
• Sensitive information may be stolen because caller masquerade as you over the
telephone
• Secure or unlisted phone numbers may be acquires from your stored information.
• Secure or unlisted phone numbers may be acquired from global information stored in PBX.

Yasir
Personel Website: www.yasirirfan.com


June 25, 2008  4:48 AM

Sample I.T Security Policy – CLIENT SECURITY

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Today there is a seminar organized by Cisco , Data Center 3.0 Statergy event at Meridian. Hopefully I get more info which I can post here. The last Cisco Expo I attended was held two months back. Which was simply outstanding. Ok now lets get back to out Series of Security Policies, today I am going to eloborate the Client Security policy.

CLIENT SECURITY

“IS” CONSIDERED THE FOLLOWING:
1. If attachment via the Internet is allowed, be absolutely certain that home users who attach via the Internet do not have file sharing turned on. For Windows clients, use automatic scanning software across the range of IP addresses attached to the network to make sure that no clients respond on TCP/IP port 139.
2. Instruct users to avoid inappropriate local access and creating or modifying shares.
3. Remove the remote access and dial-up connection services from clients on the network. There should be no need for remote access outbound connections from computers on networks that are connected to the Internet.
4. Organisation owned computers used by work-at-home telecommuters cannot be connected to the Internet or used by any family member other than the employee.
5. Employees shall use their own computers at home for entertainment or personal interests.
6. Client computers shall not be configured to use any sort of remote access software.
7. Clients shall not be configured to answer dial-in security connections.
8. Do not allow users to install software on their clients. Take removable media drives like floppy,CD-ROM, and Zip drives out of client computers since all authorized software installations can occur over the network.
9. Do not install file and print sharing on clients unless absolutely necessary. Encourage users to store all files on network file servers, and create server pools of resources.
10. Remove all modems and other alternative access devices from client computers.
11. Each client computer should have one-and only one-possible connection to any data network.
12. Restrict logon access to the network to the computers that an employee normally uses. This makes it impossible to exploit an account name and password from anywhere other than the user’s regular computer except nursing stations.
13. Disable all unused I/O ports, especially parallel ports, USB ports that are not attached to printers,since many alternate access devices are capable of attaching through the printer/USB port.
14. Disable unused serial /USB ports in the BIOS of client computers. But strong administrative passwords in the BIOS setup pages of client computers to maintain central control of network security.

Yasir
My Personel Website:www.yasirirfan.com

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June 24, 2008  1:19 PM

Cisco Cool tips- Series 3 -Show Controller Utilization

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

Here is one more cool command which shows a summary of port utilization on all ports,including percentage and backplane/fabric utilization:

The show controllers utilization command on the Cisco catalyst 3560 (other IOS switches probably support
this) running Cisco IOS Software Release 12.2(44)SE1

MBGF-DAC-3560-AS02#sho controllers utilization
Port Receive Utilization Transmit Utilization
Gi0/1 0 0
Gi0/2 0 0
Gi0/3 0 0
Gi0/4 0 0
Gi0/5 0 0
Gi0/6 0 0
Gi0/7 0 0
Gi0/8 0 0

Total Ports : 52
Switch Receive Bandwidth Percentage Utilization : 0
Switch Transmit Bandwidth Percentage Utilization : 0

Switch Fabric Percentage Utilization : 0

MBGF-DAC-3560-AS02#


June 24, 2008  5:19 AM

Sample IT Security Policy – User Security

Yasir Irfan Yasir Irfan Profile: Yasir Irfan

As promised I am trying to cover the topics I posted in my first post, now we are proceeding towards the User Security. We should consider the following while drafting the User Security policy.

3‐USER POLICY
“IS” CONSIDERED THE FOLLOWING:
1. Networked systems shall update regularly with the latest vendor patches for all software executed on Workstations and Servers.
2. Users shall select passwords that cannot be found in a dictionary and that are of sufficient length that the probability of determining the password over a network shall take at least 160 hours. Currently, this is at least 8 characters but shall be automatically increased as technology allows.
3. All users passwords attached to a network wherein a compromise has occurred or is suspect shall be changed immediately.
4. Enable client operating system user profiles so that specific users and groups have their own security settings that reflect their level of trust in the network.
5. Force password changes often. Passwords should be valid for no longer than 30 days.
6. Train users to prevent mishaps, by doing things such as turning off a workstation that holds shared data when it is not required.
7. Execute a virus scanner automatically whenever a user logs onto the computer.
8. Use workstation user accounts and system policies to prevent individual users from controlling the security of their workstations.
9. Disable password caching so passwords do not accumulate on client computers.
10. Client computers shall be restricted such that their network settings may not be modified by nonadministrative personnel. Implement the following specific policies:

* Disable the network control panel for all users except administrator and trusted knowledgeable users.
* Disable the registry editing tools for all users except system administrators.
* Enable the shell restrictions for accounts that serve a particular purpose, such as public e-mail accounts, public word-processing accounts, process control, etc.
* Hide the general and details pages for printers in the network, disable deletion of printers,and disable the addition of printers.
* Hide the remote administration page and the user profiles page for all users except administrators.

11. Disable booting the A: drive in the BIOS and apply a password to the BIOS to keep the user from using a DOS boot floppy.
12. Hide the display settings page from everyone except administrators.
13. Limit the rights of default Administrators group, and create a separate group with full access.
14. Provide periodic security training for new and established employees alike. A periodic refresher keeps users aware of security problems.
15. Require alphanumeric passwords so that a hacker cannot quickly determine the password to a user account simply by performing a “dictionary scan.”
16. Modify the client operating system to boot directly to the allowed application or a menu restricted to allowed applications.
17. All users of workstation and pc’s are to ensure that their screens are blank when not to be used
18. Approving Login procedures must be strictly observed a users leaving their screen unattended must firstly lock access to their workstation because may be unauthorized systems may be gained via a valid user is and password.
19. Managing user access must be authorized by the owner of the system and such access,including the appropriate access rights or privileges must be recorded in an access control list. Such records are to be regarded as high confidential documents.

Yasir
Personel Web Site:www.yasirirfan.com

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