Download New Updated (July) Cisco 400-101 Actual Test 301-310

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QUESTION 301

Refer to the exhibit. R1 is configured as shown. R1 is able to establish a neighbor adjacency only with R2. Which addition must you make to the R1 configuration to allow it to establish an adjacency with R3?

 

clip_image002

 

A.

interface gigabitethernet 0/1

ip address 10.1.0.1 255.255.255.0

ip ospf network point-to-point

B.

interface gigabitethernet 0/1

ip address 10.1.0.1 255.255.255.0

ip ospf 1 area 0

C.

router ospf 1

network 10.1.0.0 0.0.0.255 area 1

D.

router ospf 1

area 0 stub

 

Correct Answer: C

Explanation:

To enable interfaces and networks with OSPF, the networks need to be specified in the network statement. In the configuration shown, only 10.0.0.0/24 has been enabled, we are missing the network connecting to R3 (10.1.0.0/24).

 

 

QUESTION 302

Which two options are valid for the number of bytes in a BGP AS number? (Choose two.)

 

A.

2 bytes

B.

4 bytes

C.

6 bytes

D.

8 bytes

E.

16 bytes

 

Correct Answer: AB

Explanation:

During the early time of BGP development and standardization, it was assumed that availability of a 16 bit binary number to identify the Autonomous System (AS) within BGP would have been more than sufficient. The 16 bit AS number, also known as the 2-byte AS number, provides a pool of 65536 unique Autonomous System numbers. The IANA manages the available BGP Autonomous System Numbers (ASN) pool, with the assignments being carried out by the Regional Registries. The current consumption rate of the publicly available AS numbers suggests that the entire public 2-byte ASN pool will be fully depleted. A solution to this depletion is the expansion of the existing 2-byte AS number to a 4-byte AS number, which provides a theoretical 4,294,967,296 unique AS numbers. ARIN has made the following policy changes in conjunction with the adoption of the solution.

The Cisco IOS BGP “4-byte ASN” feature allows BGP to carry a Autonomous System Number (ASN) encoded as a 4-byte entity. The addition of this feature allows an operator to use an expanded 4-byte AS number granted by IANA.

 

 

QUESTION 303

Which statement about the BGP scope of the cost community is true?

 

A.

It is shared with IBGP neighbors only.

B.

It is shared with IBGP neighbors and route reflectors.

C.

It is shared with EBGP neighbors only.

D.

It is shared with IBGP and EBGP neighbor
s.

E.

It is shared with IBGP and confederation peers.

 

Correct Answer: E

Explanation:

The BGP Cost Community feature introduces the cost extended community attribute. The cost community is a non-transitive extended community attribute that is passed to internal BGP (iBGP) and confederation peers but not to external BGP (eBGP) peers. The cost community feature allows you to customize the local route preference and influence the best path selection process by assigning cost values to specific routes.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/s_bgpcc.html

 

 

QUESTION 304

Refer to the exhibit. Why is the loopback 0 interface of R4 missing in the routing table of R2?

 

clip_image004

 

A.

R2 is configured as a route reflector client.

B.

There is no peering between R2 and R3.

C.

The next hop is not reachable from R2.

D.

The route originated within the same AS.

 

Correct Answer: B

Explanation:

In the “show ip bgp” output we see that there is no peering session between R2 and R3. Since R3 is the route reflector here, R3 would reflect routes advertised from R4 to R2, but the peer needs to be established first.

 

 

QUESTION 305

Which statement is true about conditional advertisements?

 

A.

Conditional advertisements create routes when a predefined condition is met.

B.

Conditional advertisements create routes when a predefined condition is not met.

C.

Conditional advertisements delete routes when a predefined condition is met.

D.

Conditional advertisements create routes and withhold them until a predefined condition is met.

E.

Conditional advertisements do not create routes, they only withhold them until a predefined condition is met.

 

Correct Answer: E

Explanation:

The Border Gateway Protocol (BGP) conditional advertisement feature provides additional control of route advertisement, depending on the existence of other prefixes in the BGP table. Normally, routes are propagated regardless of the existence of a different path. The BGP conditional advertisement feature uses the non-exist-map and the advertise-map keywords of the neighbor advertise-map command in order to track routes by the route prefix. If a route prefix is not present in output of the non-exist-map command, then the route specified by the advertise-map command is announced. This feature is useful for multihomed networks, in which some prefixes are advertised to one of the providers only if information from the other provider is not present (this indicates a failure in the peering session or partial reachability).

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16137-cond-adv.html

 

 

QUESTION 306

Refer to the exhibit. How can Router X in AS70000 peer with Router Y in AS65000, in case Router Y supports only 2- byte ASNs?

 

clip_image006

 

A.

Router X should be configured with a remove-private-as command, because this will establish the peering session with a random private 2-byte ASN.

B.

It is not possible. Router Y must be upgraded to an image that supports 4-byte ASN.

C.

Router Y should be configured with a 4-byte AS using the local-as command.

D.

Router X should be configured with a 2-byte AS using the local-as command.

 

Correct Answer: D

Explanation:

Since router Y does not support 4-byte ASN,s it will not understand any AS numbers larger than 65535, so router X should use the local-as command on the peering statement to router Y to so that it sends in a 2-byte ASN to router Y.

 

 

QUESTION 307

Which statement about BGP and diverse path advertisement is true?

 

A.

The BGP best-path selection must be disabled.

B.

The BGP best-path selection algorithm has been changed to always ignore the IGP metric.

C.

The BGP best-path selection algorithm has been changed so that two BGP paths can be flagged as best in the BGP table.

D.

The BGP best-path selection algorithm has not been changed.

E.

The BGP best-path selection is disabled for BGP routes for which the feature is enabled.

 

Correct Answer: D

Explanation:

The BGP Diverse Path Using a Diverse-Path Route Reflector feature allows BGP to distribute an alternative path other than the best path between BGP speakers when route reflectors are deployed. This additional path is added to the best-path, and the best path algorithm still remains unchanged.

 

 

QUESTION 308

For which two conditions is Cisco Express Forwarding recursion disabled by default when the BGP Prefix Independent Convergence functionality is enabled? (Choose two.)

 

A.

next hops learned with a /24 mask

B.

next hops learned with any mask shorter than /32

C.

next hops learned with a /32 mask

D.

next hops that are directly connected

 

Correct Answer: CD

Explanation:

Recursion is the ability to find the next longest matching path when the primary path goes down. When the BGP PIC feature is not installed, and if the next hop to a prefix fails, Cisco Express Forwarding finds the next path to reach the prefix by recursing through the FIB to find the next longest matching path to the prefix. This is useful if the next hop is multiple hops away and there is more than one way of reaching the next hop.

However, with the BGP PIC feature, you may want to disable Cisco Express Forwarding recursion for the following reasons:

When the BGP PIC functionality is enabled, Cisco Express Forwarding recursion is disabled by default for two conditions:

For all other cases, Cisco Express Forwarding recursion is enabled.

Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/irg-bgp-mp-pic.html

 

 

QUESTION 309

How many bytes comprise the system ID within an IS-IS NET?

 

A.

4 bytes

B.

6 bytes

C.

8 bytes

D.

16 bytes

E.

20 bytes

 

Correct Answer: B

Explanation:

Routers are identified with NETs of 8 to 20 bytes. ISO/IEC 10589 distinguishes only three fields in the NSAP address format: a variable-length area address beginning with a single octet, a system ID, and a 1-byte n-selector. Cisco implements a fixed length of 6 bytes for the system ID, which is like the OSPF router ID.

Reference: http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml

 

 

QUESTION 310

Which two statements about IS-IS are true? (Choose two.)

 

A.

The default hello interval is 10 seconds and the default hold timer is 30 seconds.

B.

The hello interval can be changed on a per-interface basis with the command isis hello- multiplier.

C.

Both routers need to have the same hello intervals and hold timers in order to form IS-IS neighbors.

D.

Both IS-IS routers need to have the same capabilities in the hello packet in order to form neighbors.

 

Correct Answer: AB

Explanation:

isis hello-interval

To specify the length of time between hello packets that the Cisco IOS software sends, use the isis hello-interval command in interface configuration mode. By default, a value three times the hello interval seconds is advertised as the hold time in the hello packets sent. (Change the multiplier of 3 by specifying the isis hello-multiplier command.) With smaller hello intervals, topological changes are detected faster, but there is more routing traffic.

The default is 10 seconds.

Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/iproute/command/reference/fiprrp_r/1rfisis.html

 

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