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April 20, 2010  8:30 AM

Make sure to clear ARP



Posted by: Yasir Irfan
ARP, Cisco Firewall, Cisco PIX firewall, Cisco Tips, clear arp, clear arp-cache, NAT tips, Network troubleshooting tips, router tips, Switch Tips

 

Most of the times I have noticed, whenever someone configures a NAT in a Cisco PIX firewall 525 or...

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November 26, 2008  5:59 AM

What is Dynamic ARP Inspection (DAI) ?



Posted by: Yasir Irfan
ARP, Cisco, Cisco Learning, Cisco Tips, DAI, DHCP, DHCP Snooping, Dynamic ARP Inspection, IP to MAC, Network Security, Security Features, Switches, Switching

Dynamic ARP inspection is a security feature which validates ARP packet in a network. Dynamic ARP inspections validates the packet by performing IP to MAC address binding inspection stored in a trusted database (the DHCP snooping database) before forwarding the packet....

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September 1, 2008  9:42 AM

Most Commonly used Network Layer Utilities



Posted by: Yasir Irfan
ARP, CCNA, Certifications, Cisco, Cisco Learning, Cisco Tips, DHCP, DNS, Network Layer Utilities, Networking, OSI Layer 3, Ping

I was just thinking about the most commonly used Network Layer utilities in day to day business. Here are they which are useful to guys who are aspiring for their CCNA. 1) Address Resolution Protocol (ARP) 2) Domain Name Systems (DNS) 3) Dynamic Host Configuration Protocol (DHCP) 4)...

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