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Miscellaneous Questions

April 23rd, 2017 Go to comments

Question 1

Question 2

Explanation

Cisco Express Forwarding (CEF) provides the ability to switch packets through a device in a very quick and efficient way while also keeping the load on the router’s processor low. CEF is made up of two different main components: the Forwarding Information Base (FIB) and the Adjacency Table. These are automatically updated at the same time as the routing table.

The Forwarding Information Base (FIB) contains destination reachability information as well as next hop information. This information is then used by the router to make forwarding decisions. The FIB allows for very efficient and easy lookups.

The adjacency table is tasked with maintaining the layer 2 next-hop information for the FIB.

Question 3

Explanation

A late collision is defined as any collision that occurs after the first 512 bits of the frame have been transmitted. The usual possible causes are full-duplex/half-duplex mismatch, exceeded Ethernet cable length limits, or defective hardware such as incorrect cabling, non-compliant number of hubs in the network, or a bad NIC.

Note: On an Ethernet connection, a duplex mismatch is a condition where two connected devices operate in different duplex modes, that is, one operates in half duplex while the other one operates in full duplex.

Question 4

Question 5

Explanation

The ping command first sends an echo request packet to an address, then waits for an echo reply. The ping is successful only if:
+ The echo request gets to the destination, and
+ The destination is able to get an echo reply back to the source within a predetermined time called a timeout. The default value of this timeout is two seconds on Cisco routers.

Reference: http://www.cisco.com/c/en/us/support/docs/ios-nx-os-software/ios-software-releases-121-mainline/12778-ping-traceroute.html

Question 6

Explanation

There are many options to choose when using extended ping. Below shows the options that we can choose:

extended_ping.jpg

In which:

+ Repeat count [5]: Number of ping packets that are sent to the destination address. The default is 5 -> A is correct.
+ Source address or interface: The interface or IP address of the router to use as a source address for the probes -> B is correct.

For more information about extended ping, please read: http://www.cisco.com/c/en/us/support/docs/ip/routing-information-protocol-rip/13730-ext-ping-trace.html

Question 7

Explanation

We are not sure about this question. But below is information about the shadowed rule for your reference.

Shadowed Rule: These are rules that will never be executed because of improper access-list order. A shadowed rule occurs when a general rule precedes a specific one. For example, if the first rule that says “allow all outbound web traffic” and then a second rule (lie under the first rule) says “deny all outbound traffic to Google” the second rule will never be executed.

The following is a simple example of shadowed rules:

access-list acl permit ip 1.0.0.0 255.0.0.0 any
access-list acl permit ip 1.1.0.0 255.255.0.0 any

-> The second rule never matches.

Question 8

Question 9

Explanation

The “show users” shows telnet/ssh connections to your router while “show sessions” shows telnet/ssh connections from your router (to other devices). The question asks about “your active Telnet connections”, meaning connections from your router so the answer should be A.

Comments (18) Comments
  1. magnifico
    February 26th, 2017

    in traffic policing, the diagram shows tht excessive data has been trimmed..wouldnt that cause jiblish data??

  2. magnifico
    February 26th, 2017

    am asking concerning the diagram

  3. packet
    March 7th, 2017

    in which byte of an ip packet can traffic be marked?
    a the Qos byte
    b the Cos byte
    c the Tos byte
    d the DSCP byte
    help plzzzzzz

  4. GTAV
    March 13th, 2017

    packet, I’m almost certain it’s C, Type of Service byte.

  5. Alencar
    March 25th, 2017

    in which byte of an ip packet can traffic be marked?

    Answer correct “D”

    Explaining:
    QoS = Prioritization of traffic marked on router and IP Backbone;
    CoS = Prioritization of traffic marked in Switches and Datacenter Switches;
    ToS = Are the types of files marked (VOICE, DATA, VIDEO).
    DSCP = Responsible for performing package markup.

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    March 27th, 2017

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  7. BBBB
    March 28th, 2017

    why the right answer not TOS

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    April 1st, 2017

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    April 2nd, 2017

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  10. BBBB
    April 8th, 2017

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    April 12th, 2017

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    April 21st, 2017

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    April 30th, 2017

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  14. Mads
    May 31st, 2017

    in which byte of an ip packet can traffic be marked?

    Correct Answer is TOS Byte.

    Explaining:
    QoS = Prioritization of traffic marked on router and IP Backbone;
    CoS = Prioritization of traffic marked in Switches and Datacenter Switches;
    ToS = Are the types of files marked (VOICE, DATA, VIDEO).
    DSCP = Responsible for performing package markup.

    Though the above explanations are correct DSCP is not a Byte (it’s only 6 bits, a sub-group of a TOS byte)

    TOS(8 bits) = DSCP (6 bits)+Unused (2 bits)

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    July 24th, 2017

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    July 24th, 2017

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    July 26th, 2017

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    July 26th, 2017

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