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Host A pings interface S0/0 on router 3. What is the TTL value for that ping?

Refer to the exhibit.

image

Host A pings interface S0/0 on router 3. What is the TTL value for that ping?

A. 252
B. 253
C. 254
D. 255


Answer : B


Explanation:

The TTL or Time-To-Live gives you an indication of the number of routers between the source and destination. The TTL is used to prevent an IP packet from looping inside an IP network and causing a network meltdown. The initial TTL packet value for an IP packet is 255 and then it is decremented by 1 each time it encounters a router. When this value reaches 0, the packet is discarded by a router. The TTL value is contained in each IP packet including ICMP packets. The TTL value given by the ping command is in fact the TTL value of an echo_response packet. By default, Windows will decrease the TTL by 128 and Ubuntu Linux by 192.

ping253topo

The above the exact topology of this questions. I used 10.0.0.1 for Host A’s IP address and 12.0.0.2 for R3 S0/0’s IP address. All router has been configured with EIGRP routing protocol. And following is the output of ping 12.0.0.2.

ping253

Now the TTL value is 253.

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Comments

  1. AnonymousNovember 26, 2014 at 1:06 AM

    excellent

    ReplyDelete
  2. AnonymousJune 21, 2016 at 10:17 PM

    good explanation,

    ReplyDelete
  3. UnknownApril 1, 2017 at 3:35 AM

    Very nice explanation. We need all the questions which are asked in CCNA or CCNP exam questions with explanation. This will be most appreciate.we Hope for this. Thanks Ram

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  6. AnonymousJanuary 12, 2018 at 1:41 AM

    In the end this is a very simple system, thank you a lot for explanation. The initial TTL packet value for an IP packet is 255 and then it is decremented by 1 each time it encounters a router. When this value reaches 0, the packet is discarded by a router. The TTL value is contained in each IP packet including ICMP packets. And what is about one hour translation review ? Does the algorithm vary?

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