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September 18th, 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

Explanation

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

Explanation

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.

ip_phone_2.jpg

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.

Cisco_IP_Phone_data_voice_VLANs.jpg

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

Comments
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  12. QRT
    December 10th, 2017

    Q8
    What is the behavior of an access port when a tagged packet is received other than the access VLAN value?
    See VLAN Hopping.

  13. Anonymous
    December 10th, 2017

    Can anyone explain Question 5?
    Which two statements apply to topology-based switching?
    A. It is functionally equivalent to Cisco Express Forwarding
    B. It is the preferred switching mode in Cisco multilayer switches
    C. It uses Loop free protocol for switching
    D. disabled by default

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  16. Anonymous
    January 15th, 2018

    Question 5 Explanation – From CCNP Switch Cisco Press 300-115:

    Topology based switching: The second generation of MLS, utilizing specialized hardware,
    is also organized with distinct RP and SE functions. The RP uses Layer 3 routing
    information to build and prepopulate a single database of the entire known network
    topology. This database becomes an efficient table lookup in hardware, and is consulted
    so that packets can be forwarded at high rates by the SE. The longest match
    found in the database is used as the correct Layer 3 destination. As the routing
    topology changes over time, the database contained in the hardware can be updated
    dynamically with no performance penalty.

    This type of MLS is known as Cisco Express Forwarding (CEF). A routing process
    running on the switch downloads the current routing table database into the
    Forwarding Information Base (FIB) area of hardware. CEF is discussed in greater
    detail in Chapter 11 , “Multilayer Switching.”

    CEF is enabled on all CEF-capable Catalyst switches by default. In fact, many switches
    run CEF inherently, so CEF never can be disabled.

    Answers are A and B

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  18. Anonymous
    February 1st, 2018

    Question 9
    Can anyone explain to me the question?

    Which switchport feature will block the packet with unknown MAC address from sending it via port.

    A. switchport protect
    B. switchport block unicast
    C. switchport portfast
    D. packet with unknown MAC will be dropped

  19. Anonymous
    February 4th, 2018

    By default, the switch floods packets with unknown destination MAC addresses out of all ports. If unknown unicast and multicast traffic is forwarded to a protected port, there could be security issues. To prevent unknown unicast or multicast traffic from being forwarded from one port to another, you can block a port (protected or nonprotected) from flooding unknown unicast or multicast packets to other ports.

    switchport block unicast Block unknown unicast forwarding out of the port.

    https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst3560/software/release/12-2_52_se/configuration/guide/3560scg/swtrafc.html#wp1087814

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  27. Raito
    June 7th, 2018

    @Anonymous:

    Where is the problem with Q12?

    A) is correct because because the ports are in different VLANs (10 and 20)

    E) is correct because one of the aaa.aaa.aaa addresses is in VLAN 10 while the other is in VLAN 20

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