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Config Lab: Dynamic NAT 1

Config Lab: Dynamic NAT 1

Config Lab: Dynamic NAT 1

🕔11:05, 15.Oct 2021 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 does not pre-determine the specific IP addresses to map. Read Full Article
Config Lab: Static NAT 1

Config Lab: Static NAT 1

🕔09:05, 15.Oct 2021 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 permanent address to use with the static Read Full Article
Config Lab: Syslog 3

Config Lab: Syslog 3

🕔17:05, 12.Oct 2021 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 messages more and more useful. Eventually, Read Full Article
Config Lab: Syslog 2

Config Lab: Syslog 2

🕔14:05, 12.Oct 2021 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 and how to configure them. As usual, the Read Full Article
Config Lab: Syslog 1

Config Lab: Syslog 1

🕔13:05, 12.Oct 2021 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 and how a router chooses to manage Syslog Read Full Article
Config Lab: NTP Client/Server

Config Lab: NTP Client/Server

🕔11:05, 12.Oct 2021 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 mechanisms, of course, Read Full Article
Config Lab: CDP/LLDP 1

Config Lab: CDP/LLDP 1

🕔09:05, 12.Oct 2021 #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 and CCNA R&S exams.) Read Full Article
Config Lab: DAI 1

Config Lab: DAI 1

🕔17:05, 8.Oct 2021 IP uses Address Resolution Protocol (ARP) to discover the MAC address used by other hosts in the same subnet. Unfortunately, cybersecurity attacks often use legitimate protocols in unintended ways to form an attack, and ARP is no exception. To help Read Full Article
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

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