Sub-category:   Cisco » Switching

This post represents the solution and explanation for quiz-19. As shown in the quiz, a simple change of the MSTP configuration, for example changing the vlan to instance mapping, can immediatelly create short network cuts. Read along to see full explanation.

This is the solution for quiz-13 that covers Frame Relay, a topic that is very hard to find it implemented in today's networks but often seen during certification exams, as it still part of the curriculum for some of them. This is about differences between static and dynamic frame relay mappings.

This post represents the solution and explanation for quiz-1.
It shows one of the common problems, solutions and recommendations when implementing MSTP.

On 3560 and 3750 series switches, there are several ACL types that can be used, each with its own features and restrictions. This post represents the second part covering VLAN maps.

On 3560 and 3750 series switches, there are several ACL types that can be used, each with its own features and restrictions. This post represents the first part covering Port ACLs and Router ACLs.

Portfast + bpdufilter (used together) can be enabled globally or at interface level.
Although the first impression is that the only difference is the global or per-interface effect, this is not entirely true and another subtle and important difference is described in this post.