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Switch Questions

September 18th, 2017 in SWITCH 300-115 Go to comments

Question 1


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


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


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


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


The Portfast feature can be configured on both access or trunk port. This feature instructs the port to skip listening and learning state and move to forwarding state immediately.

The voice VLAN feature enables access ports to carry IP voice traffic from an IP phone. The simple example below shows how to configure voice VLAN on an interface:

interface fastethernet0/1
switchport access vlan 10
switchport voice vlan 20

Note: This is not a trunk port (although two VLANs are configured on an interface). Cisco calls this a Multi-Vlan access port.

Question 11


An IP phone contains an integrated three-port 10/100 switch. The ports, which are dedicated connections, are described as follows:
* Port 1 connects to the Catalyst series switch or other device that supports Voice-over-IP (VoIP).
* Port 2 is an internal 10/100 interface that carries the phone traffic.
* Port 3 connects to a PC or other device.


To enhance the quality of the VoIP traffic, port 2 and port 3 are often placed in two different VLANs. The VLAN carries voice traffic to and from the IP Phone is often called auxiliary VLAN (Port 2 in this case) while the VLAN carries data traffic is often the native VLAN (Port 3 in this case).

In the picture below the auxiliary VLAN is VLAN 30 while the native VLAN is VLAN 20. To use the IP Phone these two VLANs will need to be configured on the switch.


To learn how to configure auxiliary VLAN please read: http://www.cisco.com/en/US/docs/switches/lan/catalyst4000/8.1/configuration/guide/vlans.html#wp1048863.

To learn how to configure voice and data VLAN please read: http://www.cisco.com/en/US/products/hw/switches/ps4324/products_configuration_example09186a0080722cdb.shtml.

Question 12

Comment pages
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  1. Anonymous
    March 17th, 2016

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    March 17th, 2016

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  3. Jane
    March 22nd, 2016

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  4. FustratedCCNPLoser
    March 26th, 2016

    My exam was taken on 3/25/2016 as I ended up with a humiliating 643/1000. All my study material was from the CiscoPress eBook (300-115), CBT Nuggets, VCE dumps (191q) and Certprep. I put in 6-7 study hours a day for nearly a month to pass 300-115 with extreme confidence, but I was shot down when I was roasted by the exam. The latest dumps from this site only covered about 25% of the questions given, but all the Lab Sim simulation were correct as I had LACP with STP / HRSP / AAA. I was easily able to finish the lab sims on the exam with success but fell way short when it came the questions with educated guesses. I would like to know if anyone can help me out to receive the latest dumps soon. Thanks. c_brotha @ yahoo.com

  5. coolpass
    March 28th, 2016

    @ all
    I took the exam and I passed with a score of 937 out of 1000.
    Study dumps from EnsurePass.Here is the question from it.

    The network monitoring application alerts a network engineer of a client PC that is acting as a rogue DHCP server. Which two commands help trace this PC when the MAC address is known? (Choose two.)
    A. switch# show mac address-table
    B. switch# show port-security
    C. switch# show ip verify source
    D. switch# show ip arp inspection
    E. switch# show mac address-table address
    Correct Answer: AE
    These two commands will show the MAC address table, including the switch port that the particular host is using. Here is an example output:
    Switch>show mac-address-table

    Dynamic Addresses Count: 9
    Secure Addresses (User-defined) Count: 0
    Static Addresses (User-defined) Count: 0
    System Self Addresses Count: 41
    Total MAC addresses: 50
    Non-static Address Table:
    Destination Address Address Type VLAN Destination Port
    ——————- ———— —- ——————–
    0010.0de0.e289 Dynamic 1 FastEthernet0/1
    0010.7b00.1540 Dynamic 2 FastEthernet0/5
    0010.7b00.1545 Dynamic 2 FastEthernet0/5

    However, I highly suggest to read the Cisco Press and watch CBT nuggets tutorials.
    Thanks for sharing your experienced here and thanks Certprepare.

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    March 31st, 2016

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    May 4th, 2016

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    May 11th, 2016

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    May 13th, 2016

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  19. Anonymous
    May 23rd, 2016

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    July 18th, 2016

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    July 23rd, 2016

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    July 23rd, 2016


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  35. Hossam Shaaban
    September 3rd, 2016

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  36. Notmyrealname
    September 6th, 2016

    I failed switch by 10 marks! aargh..
    Is there anyone who has failed the first time and passed it again?
    Can we expect some questions from the 1st or will it be completely new questions?
    Especially for simulations?

  37. Anonymous
    September 7th, 2016

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  42. burned
    September 9th, 2016

    I spent alot of time studying other than list of questions from this site . That was a somewhat waste of time as Surprisingly all the questions were the same as I downloaded from a link in comments at certprepare. I should have studied just certprepare with fulll questions and answers. I was lucky the link was there and remembered the cerprepare q and a.
    But didnt know labs AAA and STP Lacp inside and out. Drag and drop was cdp and lldp features. and hsrp sim Find the link or pay and get questions as they are same as tst

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  48. UK
    September 18th, 2016

    Passed my CCNP switching (979 points) on 17th of September.
    All question were from 191q (still valid).
    Labs: AAA dot1x and LACP
    Sim: HSRP
    Drag and drop: CDP and LLDP

    Good luck to everyone!!!

  49. Anonymous
    September 19th, 2016

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    please provide me with the 191q .
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  50. UK
    September 19th, 2016

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