May
15
When preparing for any Network Certification Exam, one of the first topics that you’ll learn about are Access Control Lists (ACLs). Every document or Certification-related book I’ve ever read introduces students to ACLs from the perspective of IPv4 Access-Lists. Sometimes MAC Access-Lists are also mentioned briefly, but only to let the reader know they exist as another type of ACL. Rarely are any details given about how MAC ACLs actually work, or what their significant limitations are. Read More
Mar
01
A key to the mastery of a CCENT-level of networking knowledge is to intimately understand the use of Layer 2 and Layer 3 addressing when two hosts communicate on the network. This blog post will detail how these addresses are used during the network communications between two host devices (Personal Computers, PCs). Here is the topology that will be used in this example: Read More
Feb
05
Within the scope of Metro Ethernet services, it is often beneficial to provide customers "point-to-point" VLAN service, where VLAN (multipoint service in essence) is effectively set up to emulate ethernet "pseudowire", by disabling MAC-address learning. The benefit comes from saving metro switches CAM tables address space, thus improving overall scalability (which is far from perfect with Ethernet). There is special command, mac address-table learning available on Cisco Metro swtiches (e.g. ME... Read More

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