Home > IS-IS Questions

IS-IS Questions

Question 1

Refer to the exhibit.

conf t
router isis 1
net 49.5200.1580.3500.6002.00

conf t
router isis 1
net 49.5200.1580.3500.6002.00

Router A and router B are physically connected over an Ethernet interface, and ISIS is configured as shown. Which option explains why the ISIS neighborship is not getting formed between router A and router B?

A. same area ID
B. same N selector
C. same domain ID
D. same system ID


Answer: D

Question 2

Which three statements about IS-IS are true? (Choose three)

A. IS-IS can be used only in the service provider network.
B. IS-IS can be used to route both IP and CLNP.
C. IS-IS has three different levels of authentication: interface level, process level, and domain level.
D. IS-IS is an IETF standard.
E. IS-IS has the capability to provide address summarization between areas.


Answer: B C E

Question 3

Which three elements compose a network entity title? (Choose three)

A. area ID
B. domain ID
C. system ID
D. NSAP selector
E. MAC address
F. IP address


Answer: A C D

Question 4

Refer to the exhibit.


Why is the neighbor relationship between R2 and R4 shown as ES-IS?

A. because there is an MTU mismatch between R2 and R4
B. because interface S3/0 of R4 is configured as L1/L2
C. because interface S3/0 of R2 is configured as L1
D. because there is a hello interval mismatch between R2 and R4


Answer: C

Question 5

Refer to the exhibit.


Which statement is true?

A. IS-IS has been enabled on R4 for IPv6, single-topology.
B. IS-IS has been enabled on R4 for IPv6, multitopology.
C. IS-IS has been enabled on R4 for IPv6, single-topology and multitopology.
D. R4 advertises IPv6 prefixes, but it does not forward IPv6 traffic, because the protocol has not been enabled under router IS-IS.


Answer: A

Question 6

Refer to the exhibit.


Why is the neighbor relationship between R1 & R2 and R1 & R3 an L2-type neighborship?

A. because the area ID on R1 is different as compared to the area ID of R2 and R3
B. because the circuit type on those three routers is L1/L2
C. because the network type between R1, R2, and R3 is point-to-point
D. because the hello interval is not the same on those three routers


Answer: A

Question 7

With which ISs will an ISIS Level 1 IS exchange routing information?

A. Level 1 ISs
B. Level 1 ISs in the same area
C. Level 1 and Level 2 ISs
D. Level 2 ISs


Answer: B

Question 8

Which three statements about the designated router election in IS-IS are true? (Choose three)

A. If the IS-IS DR fails, a new DR is elected.
B. The IS-IS DR will preempt. If a new router with better priority is added, it just becomes active in the network.
C. If there is a tie in DR priority, the router with a higher IP address wins.
D. If there is a tie in DR priority, the router with a higher MAC address wins.
E. If the DR fails, the BDR is promoted as the DR.
F. The DR is optional in a point-to-point network.


Answer: A B D

Comments (10) Comments
  1. source_route
    September 23rd, 2014

    question 2: IS-IS “IS” a IETF Standard

  2. Saana
    October 6th, 2014

    question 2: IS-IS is not IETF standard but it is ISO standard

  3. Saana
    October 6th, 2014

    The ISO developed IS-IS, and the Internet Engineering Task Force (IETF) developed OSPF.

  4. Hamid Saffarzadeh
    October 17th, 2014

    1. Mistake in Exhibit: the SNPA is HDLC but link is ethernet in Exhibit
    2.We see ES-IS when: I.one side is configured to send only L2 and another side is configure to send L1. In this case both sides show each-other as ES-IS. II.we have MTU Mismatch so we see ES-IS in only one side. (in my test I saw ES-IS on the side with MTU 1500 and IS-IS on the side with MTU 2000)
    So in this question because we do not know about the other side “show CLNS neighbor” A must be better choose.

  5. grendel
    October 18th, 2014

    Can anyone explain Q5?

  6. soon2beCCIE
    November 20th, 2014

    Q2 is correct:

    OSI IS-IS Intra-domain Routing Protocol

    Status of this Memo

    This RFC is a republication of ISO DP 10589 as a service to the
    Internet community. This is not an Internet standard.
    Distribution of this memo is unlimited.

  7. Q1 huh?
    November 30th, 2014

    they look the same to me

  8. Anonymous
    June 23rd, 2015

    pls cuys any updated dumps, update me on ernest.mbila@gmil.com i want to take exam on 1st July. thanks

  9. Ashritha
    September 23rd, 2015

    Q4: Ans should be A. Look at this — http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/47201-isis-mtu.html

    If R3 is configured as L1 and R4 as L1/L2 this is not reason enough for ES-IS. As the routers can still communicate.

  10. Rawa
    November 26th, 2015

    Please ISIS still there in the Written Exam CCIE R&S V5 ? because I didnt find any topic with ISIS in the blueprint

Add a Comment

Reload Image