Practice JNCIS ENT Routing and Switching dumps online test for free with answers explanations part 3 Infibee.com

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Total Questions 20
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1. The policy expression of (policy-1 || policy-2) is applied as an export within BGP. Given the following policies, what happens when the local router attempts to advertise the 172.16.1.0 /24 BGP route?
policy-1 {
term accept-routes {
from {
route-filter 172.16.1.0/24 exact;
}
then accept;
}
}
policy-2 {
term reject-routes {
from {
route-filter 172.16.1.0/24 exact;
}
then reject;
}
}

A.
It is accepted by policy-1.
B.
It is rejected by policy-2.
C.
It is accepted by the BGP default policy.
D.
It is rejected by the BGP default policy.

Correct Answers :

[A]

Explanation :

The result of policy-1 is true, which makes the entire expression true. Because policy-1 guaranteed its result, the action of then accept in policy-1 is applied to the route and it is accepted.

2. The regular expression ^6[45][5-9]..:.{2,4}$ matches which community value(s)?

A.
6455:123
B.
64512:1234
C.
64512:12345
D.
65536:1234

Correct Answers :

[B]

Explanation :

The first portion of the expression requires a five-digit AS value to be present. Option A doesn’t fit that criterion. While Option D does, it is an invalid AS number for a community. The second portion of the expression requires a value between two and four digits long. Of the remaining choices, only Option B fits that requirement.

3. The regular expression ^*:2+345?$ matches which community value(s)?

A.
65000:12345
B.
65010:2234
C.
65020:22345
D.
65030:23455

Correct Answers :

[B, C]

Explanation :

The first portion of the expression can be any AS value, so all options are still valid at this point. The second portion of the expression requires that it begin with one or more instances of the value 2.
Option A begins with 1, so it is not correct.
Following that must be 3 and 4, which each of the remaining options have. The final term requires a value of 5 to be present zero or one times. Options B and C fit this requirement, but Option D has two instances of the value 5. Therefore, only Options B and C are valid.

4. The regular expression 64512 .+ matches which AS Path?

A.
Null AS Path
B.
64512
C.
64512 64567
D.
64512 64567 65000

Correct Answers :

[C]

Explanation :

The expression requires an AS Path length of at least 2, which eliminates Options A and B. The second AS in the path may be repeated further, but a new AS number is not allowed. Option D lists two different AS values after 64512, so it does not match the expression. Only Option C fits all requirements of the regex.

5. The regular expression 64512 .* matches which AS Path?

A.
Null AS Path
B.
64512
C.
64513 64512
D.
65000 64512 64567

Correct Answers :

[B]

Explanation :

The expression requires an AS Path length of at least 1, which must be 64512. Other AS values may or may not appear after 64512. Only Option B fits this criterion.

6. What is the MaxAge of an OSPF LSA?

A.
1200 seconds
B.
2400 seconds
C.
3600 seconds
D.
4800 seconds

Correct Answers :

[C]

Explanation :

The Age field in an LSA is initialized to a value of 0 and counts up to a MaxAge of 3600 seconds.

7. Which bit in the router LSA is set to signify that the local router is an ABR?

A.
V bit
B.
E bit
C.
B bit
D.
N/P bit

Correct Answers :

[C]

Explanation :

The B bit in the router LSA is set when the local router has operational interfaces in more than one OSPF area.

8. Before using an advertised AS external LSA, an OSPF router must verify reachability to the ASBR. Which two LSA types can be used for this reachability?

A.
Router LSA
B.
Network LSA
C.
Network summary LSA
D.
ASBR summary LSA

Correct Answers :

[A, D]

Explanation :

When an ASBR is in the same area as the local router, the router LSA of the ASBR is used to provide the needed reachability. When the ASBR is in another area, the ASBR summary LSA is used.

9. Which authentication command is placed at the area hierarchy level and describes the method of authentication used?

A.
authentication-type
B.
authentication-key
C.
key-id
D.
key-value

Correct Answers :

[A]

Explanation :

Each router in the area must agree on the form of authentication used in the area by configuring the authentication-type command at the area configuration hierarchy level.

10. Which SPF algorithm database contains the result of the calculation and whose results are passed to the routing table on the router?

A.
Root database
B.
Link-state database
C.
Candidate database
D.
Tree database

Correct Answers :

[D]

Explanation :

The end result of the SPF calculation is stored in the tree database. When the algorithm completes, this information is passed to the routing table on the router for possible use in forwarding user data packets.

11. Which IS-IS TLV reports adjacencies to neighboring systems in the network?

A.
IS reachability
B.
IS neighbors
C.
IP internal reachability
D.
IP external reachability

Correct Answers :

[A]

Explanation :

Of the options given, only the IS reachability TLV reports an adjacency with a neighbor router. The IS neighbors TLV is used to report the MAC address of neighboring systems in a Hello PDU. Both the IP internal and IP external reachability TLVs report IP routing information, not adjacency status.

12. Which IS-IS TLV is used to support TE extensions that advertise information about available and reserved bandwidth in the network?

A.
IS reachability
B.
Extended IS reachability
C.
IP internal reachability
D.
Extended IP reachability

Correct Answers :

[B]

Explanation :

Information concerning available and reserved bandwidth in the network is carried in sub-TLVs encoded within the extended IS reachability TLV.

13. Which IS-IS TLV supports the use of wide metrics for connected IP subnets?

A.
IP internal reachability
B.
IP external reachability
C.
IP interface address
D.
Extended IP reachability

Correct Answers :

[D]

Explanation :

The extended IP reachability TLV uses a 32-bit address space to support interface metrics between 0 and 16,777,215.

14. How long is the AS Path of 65010 65020 {64666 64777 64888}?

A.
2
B.
3
C.
4
D.
5

Correct Answers :

[B]

Explanation :

An AS Set, designated by the curly braces, always represents a path length of 1. When combined with the AS Sequence length of 2, the total path length becomes 3.

15. Which Origin value does the JUNOS software most prefer when performing the BGP route selection algorithm?

A.
IGP
B.
EGP
C.
Incomplete
D.
Unknown

Correct Answers :

[A]

Explanation :

The JUNOS software always prefers an Origin code of IGP when performing the route selection algorithm.

16. You're examining the output of the show route detail command and see a BGP path advertisement with an inactive reason of Not best in group. What selection criterion caused this route to not be selected?

A.
MED
B.
EBGP vs. IBGP
C.
IGP Cost
D.
Peer ID

Correct Answers :

[A]

Explanation :

The JUNOS software groups routes from the same neighboring AS together based on the operation of deterministic MEDs. When the MED value of a grouped route causes it to be eliminated from contention, the Not best in group inactive reason is displayed.

17. How do two BGP peers know that they each support graceful restart?

A.
They begin transmitting End-of-RIB markers.
B.
They negotiate their support during the establishment of the session.
C.
They set the Restart State bit in the End-of-RIB marker.
D.
Graceful restart is a well-known and mandatory function of BGP.

Correct Answers :

[B]

Explanation :

Graceful restart support is negotiated during the session establishment using a capability announcement. Only when both peers support this functionality is it used for the session.

18. What defines a BGP Update message as an End-of-RIB marker?

A.
It contains only updated routes.
B.
It contains only withdrawn routes.
C.
It contains both withdrawn and updated routes.
D.
It contains neither withdrawn nor updated routes.

Correct Answers :

[D]

Explanation :

An End-of-RIB marker is an Update message with no routing information present. This includes both withdrawn and updated routes.

19. Which BGP neighbor configuration option prevents the local router from sending an Open message to a configured peer?

A.
allow
B.
passive
C.
multihop
D.
multipath

Correct Answers :

[B]

Explanation :

The passive command prevents the router from sending an Open message to its peers and establishing a BGP session. You must continue to explicitly configure peers when using this command.

20. When a BGP route is withdrawn from the local router, how much is the figure of merit increased?

A.
0
B.
500
C.
1000
D.
2000

Correct Answers :

[C]

Explanation :

The withdrawal or update of a BGP route increases the figure of merit by a value of 1000. When the attributes of an announced route change, the figure of merit is increased by 500.

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