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4A0-101 Questions and Answers

Question # 6

Which of the following best describes distance vector protocols?

A.

They periodically exchange copies of routing tables between adjacent routers and do not maintain any knowledge of links on non adjacent routers.

B.

They use shortest path first algorithms, do not exchange copies of routing tables between routers and do maintain knowledge of links on non adjacent routers.

C.

They periodically exchange copies of routing tables between adjacent routers and maintain knowledge of links on non adjacent routers.

D.

They use shortest path first algorithms, exchange copies of routing tables between routers and maintain knowledge of links on non adjacent routers.

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Question # 7

Click on the exhibit.

Router R2 has a directly connected interface to network 192.168.3.0/24 that is included in IS-IS.

If router R4 redistributes the IS-IS route to 192.168.3.0/24 into OSPF, router R3 will receive two routes to 192.168.3.0/24. Assume that all IS-IS routers are L1/L2 capable and are in the same area.

Which of the following is TRUE?

A.

Router R3 will install the IS-IS route in it's routing table.

B.

Router R3 will install the OSPF route in it's routing table.

C.

Router R3 will install an OSPF route and an IS-IS route in it's route table.

D.

There is not enough information to answer the question.

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Question # 8

Why does IPv6 not use ARP?

A.

The ARP functionality has been replaced by the Neighbor Discovery protocol.

B.

The ARP functionality is not needed due to the increased IPv6 address space.

C.

ICMPv6 reduced its role to connectivity checking and auto-configuration only.

D.

ICMFV6 replaced the ARP functionality with Multicast Listener Discovery (MLD).

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Question # 9

Which of the following about Type 4 LSAs is FALSE?

A.

A Type 4 LSA is not generated in a single area AS.

B.

A Type 4 LSA is generated by the ABRs of the area that contains the ASBR.

C.

A Type 4 LSA advertises the external networks connected to the ASBR.

D.

A Type 4 LSA is not flooded in the area that contains the ASBR.

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Question # 10

Which of the following is FALSE about the databases used by a link-state routing protocol in a single area routing domain?

A.

The link-state database has local topology information from all the routers.

B.

The adjacency database contains all the links between all the routers.

C.

The forwarding database contains the next hop for all known prefixes.

D.

The link-state database is the same for all routers.

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Question # 11

Which of the following regarding the IS-IS PSNP is FALSE?

A.

PSNPs are used on point-to-point links to acknowledge the receipt of an LSP.

B.

There are three types of PSNPs: Level 1, Level 2, and Level 1/2.

C.

A PSNP lists some of the LSPs in the router's database.

D.

PSNPs are used by an IS-IS router to request LSP information from a neighboring router.

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Question # 12

Which of the following OSPF area types are supported by the Alcatel- Lucent 7750 SR? Choose two answers.

A.

Not so stubby areas

B.

Level1 area WC

C.

Stub areas

D.

Partially stubby areas

E.

Level 2 areas

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Question # 13

Which type of IS-IS router is summarization most likely to be configured on?

A.

L1 routers

B.

L2 routers

C.

L1/L2 routers

D.

L1 and L2 routers

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Question # 14

Click the exhibit button.

What is the state of adjacency?

A.

Initializing

B.

Up

C.

Down

D.

2-Way

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Question # 15

Click the exhibit button.

Given the topology and the show commands, and assuming that router R2 advertises all of its loopbacks into OSPF, what is the correct router R1 configuration?

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Question # 16

Which of the following conditions will prevent an OSPF adjacency from reaching the full state? Choose three answers.

A.

MTU mismatch

B.

Incorrect subnet mask

C.

System interface not included in OSPF

D.

Area ID not the same

E.

Different metric set on each end of the link

F.

Router ID not defined

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Question # 17

Which of the following are similarities between OSPF and IS-IS? Choose two answers.

A.

Metric is based on hop count.

B.

Slow convergence after link failures.

C.

Support hierarchy through the use of areas.

D.

Support for CIDR.

E.

Link state updates sent using layer 3 multicast.

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Question # 18

Which of the following correctly lists the 5 OSPF packet types?

A.

Hello, link state update, link state packet, link State acknowledgement, database description.

B.

Link state update, link state refresh, link state acknowledgement, database description, notification.

C.

Hello, link state refresh, link state update, link state acknowledgement, link state authentication.

D.

Hello, link state update, link state request, link state acknowledgement, database description.

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Question # 19

Which of the following statements regarding distance vectors protocols are true?

(Choose two answers).

A.

RIPv1, RIPv2, and BGP are distance vector protocols.

B.

OSPF and IS-IS are distance vector protocols.

C.

Routing tables are exchanged between neighbors; however, no routing table is transmitted beyond the immediate neighbor.

D.

Distance vector protocols use the Dijkstra SPF algorithm.

E.

Routers that participate in distance vector routing protocols maintain full knowledge of distant routers and how they interconnect

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Question # 20

An Alcatel-Lucent 7750 SR receives a route via an IS-IS LSP with internal reach ability, and receives the same route via an OSPF type 5 LSA. If al protocol preferences are default, which route will be installed in the route table?

A.

The route learned via IS-IS will be installed.

B.

The route learned via the OSPF type 5 LSA will be installed.

C.

Both routes will be installed, if ECMP is enabled.

D.

Both routes will be installed, regardless of whether ECMP is enabled.

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Question # 21

NSSA LSA packets are what type within an NSSA area, and are converted to what other type at the ABR?

A.

They are type 7 within the area and are not modified at the ABR

B.

They are type 5 within the area and converted to type 3 at the ABR

C.

They are type 5 within the area and are not modified at the ABR

D.

They are type 7 within the area and converted to type 5 at the ABR

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Question # 22

How many databases does a Link State routing protocol use?

A.

One

B.

Two

C.

Three

D.

Four

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Question # 23

What best describes the type of packets used by OSPF routers to exchange updates on a pointto-point link?

A.

IP packets sent to an IP multicast address.

B.

Ethernet frames sent to an Ethernet multicast address.

C.

IP packets sent to an IP unicast address.

D.

UDP packets sent to an IP multicast address.

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Question # 24

In an OSPF Hello packet what fields must match all neighbor routers on the segment? (Choose 3)

A.

Area ID

B.

Hello and Dead Intervals

C.

Stub flag

D.

DR and BDR addresses

E.

The list of neighbors

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Question # 25

Which of the following statements regarding OSPF routing updates on a multi-access network segment is true?

A.

In multi-access networks, a DR and BDR are elected only if there are more than two routers connected to the network segment.

B.

In multi-access networks, a DR and BDR are elected only if the subnet masks on the router interfaces are less than /30

C.

In multi-access networks, a DR and BDR are elected. To ensure resiliency, both the DR and BDR send link-state advertisements describing the network.

D.

In multi-access networks, a DR and BDR are elected. The DR sends link-state advertisements describing the network.

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Question # 26

When redistributing OSPF into RIP V2 what must be taken into consideration for the redistribution to take place?

A.

The metric must be set accordingly for RIP

B.

The subnet mask must be removed from the OSPF route

C.

You must divide the cost of the OSPF route by three

D.

The router must be configured as an ASBR

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Question # 27

What causes an adjacency to change from "Init" to "Two Way"?

A.

When a Link State Update is received in response to a Link State Request

B.

When a router receives a Hello packet from a neighbor that contains its router id in the neighbor list

C.

When OSPF neighbors exchange Database Descriptor packets

D.

When a Link State Acknowledgement is received in response to a Link State Update

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Question # 28

The Alcatel-Lucent 7750 SR supports which two of the OSPF area types below?

A.

Not So Stubby Areas

B.

Level 1 Areas

C.

Stub Areas

D.

Partially Stubby Areas

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Question # 29

Refer to the exhibit below. IS-IS IPv6 routing is configured in the network with globally routed addresses as shown. How many routes will R4 have in its IPv6 route table?

A.

1

B.

2

C.

3

D.

4

E.

6

F.

7

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Question # 30

When multiple routing protocols offer a route for the same prefix, what part of the router is in charge of deciding which route to make active?

A.

The routing information base (RIB).

B.

The routing table manager (RTM).

C.

The equal cost multipath configuration (ECMP).

D.

The forwarding information base (FIB).

E.

The link state database (LSDB).

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Question # 31

A router receives an OSPF database description packet from a neighbor that references an LSA, which is already in the router's LSDB. The sequence number in the DBD packet is lower than the sequence number of the LSA in the LSDB.

What action does the router take?

A.

The router sends a link-state update to its neighbor.

B.

The router sends a link-state acknowledgement to its neighbor.

C.

The router updates the information in its LSDB with the information received from its neighbor.

D.

The router sends a link-state request to its neighbor.

E.

The router takes no action.

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Question # 32

Click the exhibit button.

Router R2 advertises the network 192.168.3.0/24 to router R1 via RIP.

How can router R1 ensure that it discards the route?

A.

Use an import policy and a prefix list on router R1 to reject this route.

B.

Use a prefix list on router R1 to discard all ingress IS-IS routes.

C.

Use an export policy and prefix list on router R1 to reject this route.

D.

This is not possible because RIP cannot use import policies.

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Question # 33

Click on the exhibit.

Which of the following best describes the format of data traffic sent to the server as it exits from the PC?

A.

The destination IP address will be the system IP address of router R1 and the destination MAC address will be the MAC address of the router R1 port connected to the PC.

B.

The destination IP address will be the IP address of the router R1 port connected to the PC and the destination MAC address will be the MAC address of the router R1 port connected to the PC.

C.

The destination IP address will be the IP address of the server and the destination MAC address will be the MAC address of the server.

D.

The destination IP address will be the IP address of the server and the destination MAC address will be the MAC address of the router R1 port connected to the PC.

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Question # 34

Click on the exhibit.

What is the correct command to configure a default route on the Alcatel-Lucent 7750SR R2?

A.

config> static-route 0.0.0.0/0 next-hop 10.1.2.2

B.

config>router> static-route 0.0.0.0 255.255.255.255 next-hop 10.1.2.1

C.

config>router> static-route 0.0.0.0/0 next-hop 10.1.2.2

D.

config>router> static-route 0.0.0.0/0 next-hop 10.1.2.1

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Question # 35

In an IP datagram, which field identifies the receiving application

A.

The protocol field of the transport layer header

B.

The port field of the transport layer header

C.

The protocol field of the network layer header

D.

The port field of the network layer address

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Question # 36

Graceful Restart is supported by what IGPs?

A.

RIPv1 and RIPv2

B.

OSPF

C.

IS-IS

D.

BGP

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Question # 37

An OSPF adjacency is stuck in the exstart state. What is the most likely cause?

A.

The MTU does not match on both interfaces.

B.

OSPF is not enabled on one of the routers.

C.

The router ID is the same on both routers.

D.

An OSPF Hello has not been received from the neighbor.

E.

The interfaces are configured as point-to-point on one side and broadcast on the other.

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Question # 38

When a router performs the SPF calculation, which router is used as the root of the shortest path tree?

A.

The router with the least number of links.

B.

The router with the lowest router ID.

C.

The router's closest neighbor.

D.

The router doing the calculation.

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Question # 39

Click on the exhibit.

The numbers beside the links are the metrics for that link.

Given the diagram, what path will traffic follow from router R2 to router R8, and from router R8 to router R2, if IS-IS is the routing protocol?

A.

Router R2 to router R8 will follow (R2-R3-R5-R7-R8). Router R8 to R2 will follow (R8-R7-R5-R3-R2)

B.

Router R2 to router R8 will follow (R2-R3-R4-R6-R7-R8). Router R8 to R2 will follow (R8-R7-R6-R4-R3-R2)

C.

Router R2 to router R8 will follow (R2-R3-R5-R7-R8). Router R8 to R2 will follow (R8-R7-R6-R4-R3-R2)

D.

Router R2 to router R8 will follow (R2-R3-R4-R6-R7-R8) Router R8 to R2 will follow (R8-R7-R5-R3-R2)

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Question # 40

Click on the exhibit.

The operator of an IS-IS network wishes to have link metrics dynamically calculated in the same manner as OSPF. The router with system address 10.10.10.1 is one hop away on a 1 Gbps link

Which of the following is correct?

A.

The router is correctly configured.

B.

A reference-bandwidth is not configured on the router.

C.

A reference-bandwidth is configured on the router but wide-metrics is not.

D.

The interface metric must be manually configured to 100.

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Question # 41

Click on the exhibit.

The routers have an established IS-IS L2 adjacency on which IPv4 system addresses are exchanged. An operator successfully configures multi-topology IS-IS routing so that the IPv6 system addresses are also exchanged between routers.

After IPv6 has been configured, which of the following is TRUE?

A.

Router R2 has two IS-IS-adjacencies and two LSPs.

B.

Router R2 has two IS-IS-adjacencies and four LSPs.

C.

Router R2 has two IS-IS-adjacencies and three LSPs.

D.

Router R2 has four IS-IS-adjacencies and six LSPs.

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Question # 42

Which field of an IPv6 header indicates an upper layer protocol carried in the packet?

A.

Next Header

B.

Traffic Class

C.

Flow Label

D.

Payload Length

E.

Options

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Question # 43

A static route needs to be configured with a next-hop that is NOT directly connected to the router. Which of the following must be TRUE?

A.

The router must also have an active static route to the next-hop specified in the static route command.

B.

The system address of the next-hop router must be included in the static route command.

C.

The command option "indirect" must be used in the static-route command.

D.

The system address of the router connected to the destination must be included in the static route command

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Question # 44

Click on the exhibit.

If router R2 re-distributes the IS-IS route 192.168.3.0/24 into OSPF, router R3 will receive two routes to 192.168.3.0/24. Assume that all IS-IS routers are L1/L2 capable and are in the same area.

Which of the following is TRUE?

A.

Router R3 will install the OSPF route in its routing table.

B.

Router R3 will install the IS-IS route in its routing table

C.

Router R3 will install an OSPF route and an IS-IS route in its routing table.

D.

There is not enough information to answer the question.

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Question # 45

Static routing is to be used in a network between a corporate head office with many connected networks and a branch office with one connection to the head office. Which of the following is the most likely configuration on the head office and branch office routers?

A.

The head office has a default route and the branch office has a specific static route.

B.

The head office and the branch offices both have specific static routes.

C.

The head office and the branch office both have default routes.

D.

The head office has a specific static route and the branch office has a default route

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Question # 46

Which type of OSPF LSA has the following characteristics: It is flooded only within the area it originates from and can be originated by any OSPF router within the area (including non-DR routers).

A.

Type 1 Router LSA

B.

Type 2 Network LSA

C.

Type 3 Summary LSA

D.

Type 4 ASBR LSA

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Question # 47

Which of the following statements regarding the IS-IS CSNP is false?

A.

CSNPs are used to maintain consistency in the link state database.

B.

CSNPs are advertised before an adjacency is formed with another router.

C.

There are two types of CSNPs: Level 1 and Level 2.

D.

CSNPs are advertised after an adjacency is formed with another router.

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