Networking prep

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Hiya guys, I have an interview next week, and in the pre screening phone interview a few questions came up about the port numbers used in networking and what they were used for, oh yeah, and the 7 layers of the OSI module. I Know a little bit of thew OSI, but is there any online papers etc, that could brush me up on these skills to help me out a bit? Thanks in advance, Carl.

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Below are some of the most common ports used. Ports are very flexible, the main thing is that both ends of the connection must be using the same ports at the same OSI layer in order for communication to happen. Telnet is typically 23, but if your server is set to recieve telnet on 9000 and you send it telnet on 9000, it will work. As far as a OSI layers, i found that www.networkdictionary.com has some insightful overviews. try this link http://www.networkdictionary.com/protocols/osimodel.php

tcpmux 1 TCP, UDP TCP Port Service Multiplexer
echo 7 TCP, UDP Echo
discard 9 TCP, UDP Discard
systat 11 TCP Active Users
daytime 13 TCP, UDP Daytime (RFC 867)
qotd 17 TCP Quote of the Day
msp 18 TCP, UDP message send protocol
chargen 19 TCP, UDP Character Generator
ftp-data 20 TCP, UDP File transfer default data
ftp 21 TCP, UDP File transfer control
ssh 22 TCP, UDP Remote login protocol
telnet 23 TCP, UDP Telnet
smtp 25 TCP, UDP Simple Mail Transfer
time 37 TCP, UDP Time
rlp 39 TCP, UDP Resource location protocol
nameserver 42 TCP, UDP Host name server
whois 43 TCP, UDP Who is
re-mail-ck 50 TCP, UDP Remote mail checking protocol
domain 53 TCP, UDP Domain name server
bootps 67 TCP, UDP Bootstrap protocol server
bootpc 68 TCP, UDP Bootstrap protocol client
tftp 69 TCP, UDP Trivial file transfer protocol
gopher 70 TCP, UDP Gopher
finger 79 TCP, UDP Finger
www 80 TCP, UDP World wide web or HTTP
kerberos 88 TCP, UDP Kerberos
supdup 95 TCP, UDP SUPDUP
hostname 101 TCP, UDP NIC Host Name Server
iso-tsap 102 TCP, UDP ISO-TSAP Class 0
csnet-ns 105 TCP, UDP CCSO name server protocol
rtelnet 107 TCP, UDP Remote Telnet Service
pop-2 109 TCP, UDP Post Office Protocol – Version 2
pop-3 110 TCP, UDP Post Office Protocol – Version 3
sunrps 111 TCP, UDP SUN Remote Procedure Call
auth 113 TCP, UDP Authentication Service
sftp 115 TCP, UDP Simple File Transfer Protocol
uucp-path 117 TCP, UDP UUCP Path Service
nntp 119 TCP, UDP Network News Transfer Protocol
nyp 123 TCP, UDP Network Time Protocol
netbios-ne 137 TCP, UDP NETBIOS Name Service
netbios-dgram 138 TCP, UDP NETBIOS Datagram Service
netbios-ssn 139 TCP, UDP NETBIOS Session Service
imap 143 TCP, UDP Internet Message Access Protocol
snmp 161 TCP, UDP SNMP
snmp-trap 162 TCP, UDP SNMPTRAP
cmip-man 163 TCP, UDP CMIP/TCP Manager
cmip-agent 164 TCP, UDP CMIP/TCP Agent
xdmcp 177 TCP, UDP X Display Manager Control Protocol
nextstep 178 TCP, UDP NextStep Window Server
bgp 179 TCP, UDP Border Gateway Protocol
prospero 191 TCP, UDP Prospero Directory Service
irc 194 TCP, UDP Internet Relay Chat Protocol
smux 199 TCP, UDP SMUX

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  • KasMcc
    Hi Try http://compnetworking.about.com/cs/tcpportnumbers/ Gives a list of common port numbers and assignments
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  • SoftailRico
    The OSI model is indeed, a foundamental part of your overall IT knowledge base. You should begin to commit the various layers of the OSI model and its function and purpose to memory. You will be referring to it again and again throughout your IT career in one way or another. I read once in a survey of IT professionals that the number one IT resource most often used is Google. There is plenty of information out there on the "OSI model" and "well-known ports". Get used to it. As an IT professional, you'll be spending a lot of time researching, learning and teaching yourself much stuff using what many would arguably considered to be one of the greatest inventions we have ever created; The Internet. Good luck on your interview.
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  • SearchNetworkingEditorialTeam
    Hi Carl, I wanted to point out a few things we have on SearchNetworking.com that can help get you familiar with the OSI model: Crash Course: OSI model http://searchnetworking.techtarget.com/generic/0,295582,sid7_gci1147329,00.html OSI reference guide http://searchnetworking.techtarget.com/featuredTopic/0,290042,sid7_gci901109,00.html Extending OSI to Network Security: Hack the Stack feature http://searchnetworking.techtarget.com/general/0,295582,sid7_gci1226646,00.html Kara Gattine, managing editor, SearchNetworking.com
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  • Toneroo
    I would read some of the articles here, especially this one: http://www.garykessler.net/library/tcpip.html He does a really good job of tying the OSI and TCP stacks together so that you can get a better "real-world" understanding. Kenton
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  • Toneroo
    I would read some of the articles here, especially this one: http://www.garykessler.net/library/tcpip.html He does a really good job of tying the OSI and TCP stacks together so that you can get a better "real-world" understanding. Kenton
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  • Nitint
    The best website to understand networking bacis would be http://www.firewall.cx Cheers, Nitin
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  • Jspainhour
    Another great resource is Wikipedia. I find myself referring people to it who need basic, foundational type knowledge as it includes a lot of history which helps you put things in context. Also, about every third word is a link to its definition.
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  • Enterprisephil
    for interviews: Ports to stick to: Port # Common Service Port # Common Service Protocol Protocol 20 TCP ftp-control 80 TCP http 21 TCP ftp-data 110 TCP pop3 23 TCP telnet 161 UDP snmp 25 TCP smtp 162 UDP snmp-trap 53 TCP/UDP dns 443 TCP https(http/ssl) 69 UDP tftp 70 TCP gopher 1080 TCP socks 79 TCP finger 33434 UDP traceroute Memorise these above ports. Secondly.. http://www.windowsecurity.com/img/upl/osi_layers.gif has a three columned approach. The OSI layer is one of the ways of expressing levels of inter system communication. TCP/IP is another approach and LAN is another. Mnemonically: Please Do Not Test Senior Project Administrators. Physical/Data/Network/Transport/Session/Presentation/Application
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