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CEF & Fast Switching

September 14th, 2015 in ROUTE 300-101 Go to comments

Question 1

Explanation

The command “show ip cef” is used to display the CEF Forwarding Information Base (FIB) table. There are some entries we want to explain:
+ If the “Next Hop” field of a network prefix is set to receive, the entry represents an IP address on one of the router’s interfaces. In this case, 192.168.201.2 and 192.168.201.31 are IP addresses assigned to interfaces on the local router.
+ If the “Next Hop” field of a network prefix is set to attached, the entry represents a network to which the router is directly attached. In this case the prefix 192.168.201.0/27 is a network directly attached to router R2’s Fa0/0 interface.

But there are some special cases:
+ The all-0s host addresses (for example, 192.168.201.0/32) and the all-1s host addresses (not have in the output above but for example, 192.168.201.255/32) also show as receive entries.
+ 255.255.255.255/32 is the local broadcast address for a subnet
+ 0.0.0.0/32: maybe it is a reserved link-local address
+ 0.0.0.0/0: This is the default route that matching all other addresses (also known as “gateway of last resort”). In this case it points to 192.168.201.1 -> Answer C is correct.

Reference: CCNP Routing and Switching ROUTE 300-101 Official Cert Guide

Question 2

Explanation

The “show adjacency” command is used to display information about the Cisco Express Forwarding adjacency table or the hardware Layer 3-switching adjacency table.

There are two known reasons for an incomplete adjacency:
+ The router cannot use ARP successfully for the next-hop interface.
+ After a clear ip arp or a clear adjacency command, the router marks the adjacency as incomplete. Then it fails to clear the entry.

Note: Two nodes in the network are considered adjacent if they can reach each other using only one hop.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/express-forwarding-cef/17812-cef-incomp.html

Question 3

Explanation

The “show ip cache” command displays the contents of a router’s fast cache. An example of the output of this command is shown below:

show_ip_cache.jpg

Note: If CEF is disabled and fast switching is enabled, the router begins to populate its fast cache.

Question 4

Comments
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  5. Anonymous
    May 18th, 2016

    @Anonynous Q3 is fast switching because there are entries in the cache. If it were CEF, those entries would be in the FIB (Forwarding Information Base)

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  10. cls
    August 14th, 2016

    How does an IOS process a packet that should be switched by CEF without a FIB entry?

    A.By forwarding the packet
    B.By dropping the packet
    C. By creating a new FIB entry
    D.By looking in the routing table for an alternate FIB entry

    Why is the answer not D?

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    August 24th, 2016

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  13. Fatd
    September 1st, 2016

    CLs
    The answer is not D b/c the fiber table contains a mirror image of the routing table, hence there is no entry in the routing table.

  14. Fatd
    September 1st, 2016

    FIB not fiber. Friggin autocorrect.

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  37. Jane woken
    February 2nd, 2017

    can somebody tell me please that what is the last question of 40Q of TAGWA , in my life there is no answer of question “Meaning of priority 0 configured in ospf router?” . Plus what it the correct answer for the following questions?
    Question 2
    Refer to the following configuration command.
    router(config)# ip nat inside source static tcp 172.16.10.8 8080 172.16.10.8 80
    Which statement about the command is true?
    A. Any packet that is received in the inside interface with a source IP port address of
    172.16.10.8:80 is translated to 172.16.10.8:8080.
    B. Any packet that is received in the inside interface with a source IP port address of
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    Answer:?

    and

    Question 28
    A network engineer wants to ensure an optimal end-to-end delay bandwidth product. The delay is
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    A. Window scaling
    B. Network buffers
    C. Round-trip timers
    D. TCP acknowledgments
    Answer:?

    some people said the answer are wrong of TAGWA file. Please help

  38. Anonym
    February 2nd, 2017

    Question 2
    Answer: B.

    http://www.cisco.com/image/gif/paws/13772/12.pdf

    ip nat inside source static tcp 172.16.10.8 8080 172.16.10.8 80
    !−−− Static NAT command that states any packet received in the inside
    !−−− interface with a source IP address of 172.16.10.8:8080 is
    !−−− translated to 172.16.10.8:80.

  39. Jane woken
    February 2nd, 2017

    Thanks and what will the answer of these following questions. Please

    Question 28
    A network engineer wants to ensure an optimal end-to-end delay bandwidth product. The delay is
    less than 64 KB. Which TCP feature ensures steady state throughput?
    A. Window scaling
    B. Network buffers
    C. Round-trip timers
    D. TCP acknowledgments
    Answer:?

    and

    what is the last question of 40Q of TAGWA file , in my file there is no answer of question “Meaning of priority 0 configured in ospf router?”

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  41. ASK
    February 16th, 2017

    To Jane:

    Meaning of priority 0 configured in ospf router.

    Router won’t participate/cosnider for OSPF DR/BDR election.

  42. ASK
    February 16th, 2017

    Thanks and what will the answer of these following questions. Please
    Question 28
    A network engineer wants to ensure an optimal end-to-end delay bandwidth product. The delay is
    less than 64 KB. Which TCP feature ensures steady state throughput?
    A. Window scaling
    B. Network buffers
    C. Round-trip timers
    D. TCP acknowledgments

    Answer:

    B. Network buffers

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    February 22nd, 2017

    To Gus
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    March 10th, 2017

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  46. Anonymous
    March 11th, 2017

    @Jane woken

    “question “Meaning of priority 0 configured in ospf router?” is that the router does not participate in DR election process.

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    April 29th, 2017

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  49. salman rokadia
    May 16th, 2017

    hi all, the answer for 4 question in CEF is “D” not “B”

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