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IP Routing 3

November 7th, 2018 Go to comments

Question 1

Explanation

Floating static routes are static routes that have an administrative distance greater than the administrative distance (AD) of another static route or dynamic routes. By default a static route has an AD of 1 then floating static route must have the AD greater than 1. Floating static route has a manually configured administrative distance greater than that of the primary route and therefore would not be in the routing table until the primary route fails.

Question 2

Explanation

A host route for IPv4 has the mask /32, and a host route for IPv6 has the mask /128. If an IPv4 address is configured with a mask of /32 on an interface of the router, which is typical for loopback interfaces, the host route appears in the routing table only as connected (for example in the routing table we will see this line: “C 10.10.10.1/32 is directly connected, Loopback0”.

Reference: https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/116264-technote-ios-00.html

Question 3

Explanation

If the IP address exists in the routing table then we can say the local router knew the way to reach that destination. But this question wants to ask if the destination has communicated to the local router or not (“an IP address is known to a router”). Maybe it is a tricky question.

Question 4

Explanation

In all the way on the path, the source and destination IP addresses never change, only the source and destination MAC address are changed on each segment.

Question 5

Question 6

Question 7

Question 8

Question 9

Question 10

Question 11

Explanation

To check the connectivity between a host and a destination (through some networks) we can use both “tracert” and “ping” commands. But the difference between these 2 commands is the “tracert” command can display a list of near-side router interfaces in the path between the source and the destination. The “traceroute” command has the same function of the “tracert” command but it is used on Cisco routers only, not on a PC -> B is correct.

Comments (9) Comments
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  1. Mic
    October 3rd, 2018

    Question 8
    In which situation would the use of a static route be appropriate?

    A. To configure a route to the first Layer 3 device on the network segment.
    B. To configure a route from an ISP router into a corporate network.
    C. To configure a route when the administrative distance of the current routing protocol is too low.
    D. To reach a network is more than 15 hops away.
    E. To provide access to the Internet for enterprise hosts.

    The answer is E but I think it’s more correct for “default route”. So my answer is B for this questions. What do you think?

  2. bashar
    October 10th, 2018

    which definition of a host route is true ?
    A. A route that is manually configured
    B. A route used when a destination route is missing.
    C. A route to the exact /32 destination address
    D. Dynamic route learned from the server

  3. DomaJ
    February 12th, 2019

    Hi,bashar

    I think it’s C, because “A host route for IPv4 has the mask /32″…

    ref : https://www.cisco.com/c/en/us/support/docs/ip/ip-routing/116264-technote-ios-00.html

  4. bill
    March 5th, 2019

    I got stuck on host route questions in ICND1 exam lol. learning now….

  5. uur
    March 12th, 2019

    Q6&Q7
    For Q6, it makes no sense that D is the correct answer even if we consider the other options. Wrong is wrong, more senseless options can not make it right.
    Moreover, Q7’s answer is the exact opposite of Q6’s answer for the same question.

  6. bill
    May 9th, 2019

    Question 8
    In which situation would the use of a static route be appropriate?

    A. To configure a route to the first Layer 3 device on the network segment.
    B. To configure a route from an ISP router into a corporate network.
    C. To configure a route when the administrative distance of the current routing protocol is too low.
    D. To reach a network is more than 15 hops away.
    E. To provide access to the Internet for enterprise hosts.

    The answer is E but I think it’s more correct for “default route”. So my answer is B for this questions. What do you think?
    —————
    I would go with answer E. simply because we have no control of ISP router so can not configure anything FROM IT. what i have seen in cisco exams, is it focuses on what we control.

  7. BILL
    May 9th, 2019

    When troubleshooting Ethernet connectivity issues,how can you verify that an IP address is known to a router?
    A. Check whether the IP address is in the routing table
    B. Check whether an ACL is blocking the IP address
    C. Check whether the IP address is in the CAM table
    D. Check whether the IP address is in the ARP table

    I would still go with answer D. Just assume the question is referring to end user pc having connectivity issues.

  8. Q6 – Explaination
    October 27th, 2019

    If you read carefully, you’d understand. Here’s a breakdown….
    **Router R1 has a static router that is configured to a “destination network”
    **A directly connected inference is configured with an IP address in the “same destination network”
    *** Which statement about “R1” is true?

    Correct answer is in fact: It prefers the static route (Because it doesn’t mention any other routes in R1.

  9. Q6 An Q7
    December 13th, 2019

    if you realize Q6 and Q7 is exactly the same But with defferents answer. I guess the right answer is: “prefers the directly connected interface”. I agree with UUR.

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