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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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  1. Mike
    July 19th, 2017

    q.8

    I have a different dump that says B is correct I would say your answer is correct can someone please confirm?

  2. effbee0
    July 24th, 2017

    Please send me the latest dumps for 300-115 Switch.
    My email: effbee0 (at) gmail (dot) com

  3. Anonymous
    July 26th, 2017

    q8:

    Tagged frames _are_ allowed on an access port. If the tag is correct for the access VLAN, the switch strips the tag and forwards the frame. If it is for the wrong VLAN, then it should drop the frame.

    This behaviour enables VLAN hopping.

  4. Samuelity
    July 30th, 2017

    Dear all, I need latest dumps for 300-115 switch, email samuelityz (at) gmail (dot) com
    Thanks

  5. engineerarea
    August 22nd, 2017

    I wonder what all the people here are asking for these materials.

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