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Network security

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November 9, 2017  3:23 AM

What is “TCP Spurious Retransmission” ? And why does this occur for the FTP traffic passing through a Cisco ASA Firewall?

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
ASA, Cisco, Cisco ASA, Filezilla, firewall, FTP, Network security, TCP

Recently we come across an issue where FTP  connection was not established between the client and the FTP server. The connection was passing through the Cisco ASA Firewall. Upon troubleshooting, we discovered 3-way TCP handshake was happening, however, once the login name and password entered to...

October 29, 2015  3:56 PM

Cisco to acquire Lancope to enhance their Cyber Security Threat Defence Capabilities

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
Cisco, Cisco security, Network security, Networking, Security intelligence

This week Cisco announced their intention to acquire  Alpharetta, GA based network security company called Lancope, Inc for $452.5 million in cash . Lancope provides network behaviour analytics,...


October 5, 2015  3:51 AM

Review for CCNA Security 210-260 Official Cert Guide

Yasir Irfan Yasir Irfan Profile: Yasir Irfan
CCNA, CCNA Security, Cisco, Cisco Press, Email security, IPS, ISE, malware, Network security, Security threats, Social engineering, tacacs, VPN, Web security

I would like to thank my old time professional friend from Cisco Press


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