Some of you, particularly those that subscribe to the blog, will have noticed a lot of posts here at the blog in mid-October 2021. I thought I’d give you a quick update on what I’m [...]

Configuring PAT with a pool of inside global addresses combines almost everything you can possibly configure with NAT in a Cisco router. Look at the requirements in this latest lab and put [...]

PAT – Port Address Translation – plays a huge role in IPv4 networks. Today’s post looks at the simpler of the two configuration options for router NAT configuration: a single router interface IP [...]

Dynamic NAT – specifically, dynamic NAT without also doing PAT – creates a 1-to-1 mapping between an inside local address and an inside global address. Unlike static NAT, however, dynamic NAT [...]

Static NAT matches a single inside local address with a single inside global address. It does not conserve addresses, but it does let you make a server reachable to external devices with a [...]

When first starting out with Cisco routers and switches, log messages are those irritating messages that show up to interrupt us from the current task at hand. Over time, most of us find those [...]

Most of us skim through descriptions of Syslog messages and message levels. This lab helps you slow down just a bit with a configuration exercise that makes you remember message severity levels [...]

Routers and switches issue log messages to tell us about different events. Be ready to run through the various options! Today’s lab exercises a couple of those options related to message formats [...]

NTP makes me think of old spy novels and movies, where the team would set their analog watches to the same time, and say something like “On my mark, it will be 9:55… mark!”. NTP uses other [...]

#CDP has long been the default and favored protocol for a variety of device discovery functions, but LLDP offers an alternative as well. (LLDP is new to the exam topics per the May 2016 new CCENT [...]