Ensurepass

 

 

QUESTION 211

Which type of OSPF packet is an OSPF link state update packet?

 

A.

type 1

B.

type 2

C.

type 3

D.

type 4

E.

type 5

 

Correct Answer: D

Explanation:

Link State Update packets are OSPF packet type 4. These packets implement the flooding of link state advertisements. Each Link State Update packet carries a collection of link state advertisements one hop further from its origin. Several link state advertisements may be included in

a single packet.

Reference: http://www.freesoft.org/CIE/RFC/1583/107.htm

 

 

QUESTION 212

If two OSPF type 3 prefixes have the same metric, and are within the same process, which prefix(es) are installed into the routing table?

 

A.

The route whose originator has the lower router ID.

B.

Both routes are installed.

C.

The route whose originator has the higher router ID.

D.

The first route that is learned.

 

Correct Answer: B

Explanation:

OSPF allows multiple equal-cost paths to the same destination. Since all link-state information is flooded and used in the SPF calculation, multiple equal cost paths can be computed and used for routing, and each route will be installed in the routing table.

 

 

QUESTION 213

Which OSPF feature supports LSA rate limiting in milliseconds to provide faster convergence?

 

A.

LSA throttling

B.

incremental SPF

C.

fast hello

D.

SPF tuning

 

Correct Answer: A

Explanation:

The OSPF Link-State Advertisement (LSA) Throttling feature provides a dynamic mechanism to slow down link-state advertisement (LSA) updates in OSPF during times of network instability. It also allows faster Open Shortest Path First (OSPF) convergence by providing LSA rate limiting in milliseconds.

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

 

 

QUESTION 214

Which two options are BGP attributes that are updated when router sends an update to its eBGP peer? (Choose two.)

 

A.

weight

B.

local preference

C.

AS_path

D.

next-hop

 

Correct Answer: CD

Explanation:

AS_Path describes the inter-AS path taken to reach a destination. It gives a list of AS Numbers traversed when reaching to a destination. Every BGP speaker when advertising a route to a peer will include its own AS number in the NLRI. The subsequent BGP speakers who advertise this route will add their own AS number to the AS_Path, the subsequent AS numbers get prepended to the list. The end result is the AS_Path attribute is able to describe all the autonomous systems it has traversed, beginning with the most recent AS and ending with the originating AS. NEXT_HOP Attribute specifies the next hop IP address to reach the destination advertised in the NLRI. NEXT_HOP is a well-known mandatory attribute that is included in every eBGP update.

Reference: http://netcerts.net/bgp-path-attributes-and-the-decision-process/

 

 

QUESTION 215

Which BGP aggregate address configuration advertises only the aggregate address, with attributes inherited from the more specific routes?

 

A.

summary-only as-set

B.

as-set

C.

summary

D.

summary-only

 

Correct Answer: A

Explanation:

Example:

router bgp 300

neighbor 2.2.2.2 remote-as 100

neighbor 3.3.3.3 remote-as 200

neighbor 4.4.4.4 remote-as 400

aggregate-address 160.0.0.0 255.0.0.0 summary-only as-set

 

!— With the as-set configuration command, the aggregate

!— inherits the attributes of the more-specific routes.

Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/5441-aggregation.html

 

 

QUESTION 216

Refer to the exhibit. Which three statements about this configuration are true? (Choose three.)

 

clip_image002

 

A.

The default route appears in the global routing table.

B.

The static route appears in the VRF red routing table.

C.

The subnet 192.168.1.0 is unique to the VRF red routing table.

D.

The static route is added to the global routing table and leaked from the VRF red.

E.

The subnet 192.168.1.0 is unique to the global routing table.

F.

192.168.1.1 is reachable using any of the addresses on the router where the static route is configured.

Correct Answer: ABE

Explanation:

This is an example of the route leaking feature. Here, this static route is created for the red VRF so it will be installed into the red VRF routing table, but the use of the global keyword will cause this default route to appear in the global routing table.

 

 

QUESTION 217

Refer to the exhibit. If ISIS is configured utilizing default metrics, what is the cost for Router 4 to reach the 10.2.2.0/24 network?

 

clip_image004

 

A.

1

B.

20

C.

30

D.

63

 

Correct Answer: C

Explanation:

By default, every link is an IS-IS network has a metric of 10.

 

 

 

 

 

 

 

 

 

 

 

QUESTION 218

Refer to the exhibit. Which route type is displayed when you enter the command show ip route supernets-only on a device with this configuration?

 

clip_image006

 

A.

Connected

B.

OSPF

C.

RIP

D.

EIGRP

E.

An empty route set

 

Correct Answer: E

Explanation:

This command shows supernets only; it does not show subnets. In this case, the routing table would contain the 10.0.0.0/24 subnet, but not the 10.0.0.0/8 supernet.

 

 

QUESTION 219

Which statem

ent about passive interfaces is true?

 

A.

The interface with the OSPF passive interface configuration appears as a not-so-stubby network.

B.

The interface with the EIGRP passive interface configuration ignores routes after the exchange of hello packets.

C.

The interface with the IS-IS passive interface configuration sends the IP address of that interface in the link-state protocol data units.

D.

Passive interface can be configured on the interface for IS-IS.

 

Correct Answer: C

Explanation:

With IS-IS, passive interfaces are used to prevent unnecessary LSA packets out that interface, but the IP address of passive interfaces are still included in updates going out the other interfaces. This behavior is what enables the best practice of configuring loopback interfaces as passive, but still having the loopback be reachable.

 

 

 

 

 

 

 

 

 

 

 

QUESTION 220

Refer to the exhibit. Which two routes are included in the route update? (Choose two.)

 

clip_image008

 

A.

10.3.0.0

B.

10.3.2.0

C.

10.3.4.0

D.

10.3.6.0

 

Correct An

swer: CD

Explanation:

This access list will permit the 10.3.4.0, 10.3.5.0, 10.3.6.0, and 10.3.7.0 subnets.

 

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