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Switch Questions

July 7th, 2017 in SWITCH 300-115 Go to comments

Question 1

Explanation

The command “mac address-table aging-time 180” specifies the time before an entry ages out and is discarded from the MAC address table. The default is 300 seconds. Entering the value 0 disables the MAC aging.

Question 2

Question 3

Explanation

The switch learns which port the host is attaching by examining the source MAC address in frames received on a port. For example switch receives a frame with source MAC of 0000.0000.aaaa (abbreviated as “aaaa”) on port Fa0/1, it populates its MAC address-table with an entry like this “host aaaa on Fa0/1”. If the switch receives a frame with the same “aaaa” MAC from Fa0/2 then there will be a flap and the switch will log something like this:

%MAC_MOVE-SP-4-NOTIF: Host 0000.0000.aaaa in vlan 1 is flapping between port 0/1 and port 0/2

This flapping phenomenon may be the result of a Layer loop somewhere in your network, especially when STP is disabled for some reasons.

If you don’t want to see this message then issue the “no mac-address-table notification mac-move” or place a static entry with the “mac-address-table static 000.0000.aaaa vlan 1 interface fa0/1″on the switch. The command “mac-address-table notification mac-move” is disabled by default on 6500 & 7600 series but enabled by default on other series.

Question 4

Explanation

The command “show mac address-table” displays the MAC address table along with the port associated for the switch. The ‘show mac address-table address ” gives a more specific view of a specific MAC address.

Question 5

Question 6

Question 7

Question 8

Explanation

If an access port receives a tagged packet (Inter-Switch Link [ISL] or IEEE 802.1Q tagged), the packet is dropped, and the source address is not learned.

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3750x_3560x/software/release/12-2_55_se/configuration/guide/3750xscg/swint.html

Question 9

Question 10

Comments
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