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Posts From Wendell Odom

Config Lab: DHCP Snooping 2

Config Lab: DHCP Snooping 2

🕔15:05, 8.Oct 2021 Dynamic Host Configuration Protocol (DHCP), like many network protocols, can be used as part of a cybersecurity attack. DHCP Snooping, a LAN switch feature, monitors DHCP messages flowing through the switch, filtering messages based on a set of rules. In Read Full Article
Config Lab: DHCP Snooping 1

Config Lab: DHCP Snooping 1

🕔13:05, 8.Oct 2021 The Dynamic Host Configuration Protocol (DHCP) protocol allows DHCP Clients to lease an IP address from a DHCP server. Simple enough. However, the protocol itself is open to various cybersecurity attacks. The LAN switch DHCP Snooping feature can monitor DHCP Read Full Article
Config Lab: Router as DHCP Client

Config Lab: Router as DHCP Client

🕔11:05, 8.Oct 2021 While most router interfaces use configured IP addresses, in some cases, a design calls for the router to dynamically learn an interface IP address. In those cases, routers can be configured to act as a DHCP client. In many of Read Full Article
Config Lab: DHCP Relay

Config Lab: DHCP Relay

🕔09:05, 8.Oct 2021 Most DHCP servers sit in a centralized location. To make that work, routers need to participate in the DHCP process to a small degree using a feature called the DHCP Relay Agent. For this lab, you think about a classic Read Full Article
Config Lab: Basic Port Security 4

Config Lab: Basic Port Security 4

🕔15:05, 5.Oct 2021 The Cisco switch Port Security feature lets the switch monitor incoming frames, look at the source MAC address, and determine whether frames with that source address should or should not be allowed into the switch. As usual for these config labs, this Read Full Article
Config Lab: Basic Port Security 3

Config Lab: Basic Port Security 3

🕔15:05, 5.Oct 2021 Sometimes, #CCNA studiers get bogged down with port security, focusing on all those little optional configuration settings. But what of the main feature: securing the port? This latest lab revisits the big ideas of what a switch does using port Read Full Article
Config Lab: Basic Port Security 2

Config Lab: Basic Port Security 2

🕔13:05, 5.Oct 2021 Quick, can you name all the small options available with Cisco’s port security feature on Catalyst IOS images? Most of us can't, unless we're in the middle of studying for CCENT, CCNA, or CCNP R&S SWITCH. But this blog is Read Full Article
Config Lab: Basic Port Security 1

Config Lab: Basic Port Security 1

🕔09:05, 5.Oct 2021 Cisco’s Port Security feature just happens to be one of those switch features that can confuse people until they’ve configured and tested it a few times. One challenge comes from the fact that you can enable port security with one Read Full Article
Config Lab: Extended Numbered ACL 1

Config Lab: Extended Numbered ACL 1

🕔13:05, 1.Oct 2021 Ready to review how to match subnets with extended ACLs? And how to match well-known ports? Today’s lab lets you do just that. Along the way, you get to think about where to place the ACL to most efficiently filter Read Full Article
Config Lab: Standard Named ACL 1

Config Lab: Standard Named ACL 1

🕔11:05, 1.Oct 2021 Standard named ACLs follow a nice simple format, which is great for getting started with ACLs. This next lab gives you some exercise on the basic syntax, while throwing in a few issues related to the application of the ACL. Read Full Article

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