4A0-C01 Online Practice Questions and Answers

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

In IS-IS database synchronization, each router compares each LSP described in the received CSNPs with the LSPs in its own database. Which of the following actions is taken if the database contains a newer copy of the LSP?

A. The router sends a copy of the LSP from its database to its neighbor

B. The router sends a PSNP to its neighbor describing the LSP in its database.

C. The router updates its database with the LSP and floods a copy to its other neighbors.

D. The router sends a PSNP to its neighbor to request the LSP.

Which of the following statements best describes an OSPF type 3 LSA?

A. An OSPF type 3 LSA is an intra-area LSA, generated by the ABR only when route summarization is configured.

B. An OSPF type 3 LSA is an inter-area LSA, generated by the ABR only when route summarization is configured.

C. An OSPF type 3 LSA is an inter-area LSA, generated by an ASBR to describe external routes.

D. An OSPF type 3 LSA is an inter-area LSA, generated by the ABR to describe a route to neighbors outside the area.

Click on the exhibit.

What type of OSPFv3 LSA is shown?

A. Router LSA

B. Network LSA

C. Intra-Area Prefix LSA

D. Link LSA

Which approach to LSP path diversity provides the most control, but the least flexibility?

A. Administrative Groups

B. Shared Risk Link Groups

C. Strict hop LSP paths

D. Fast reroute

An IS-IS router receives a CSNP that references an older LSP than the one in its database. What action is taken?

A. The router sends a copy of the LSP from its database to its neighbor.

B. The router sends a PSNP to its neighbor describing the LSP in its database.

C. The router updates its database with the LSP and floods a copy to its other neighbors.

D. The router sends a PSNP to its neighbor to request the LSP.

A new router is added to a broadcast network. What is used by IS-IS as the tie breaker for selecting the DIS if the priorities are the same?

A. The router with the highest system ID.

B. The router with the highest loopback address.

C. The Hello packet with the highest sequence number.

D. The existing DIS remains the DIS.

E. The router with the highest interface MAC address.

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.

Which of the following is NOT an application of MPLS?

A. Enabling VPNs

B. Enabling traffic engineering

C. Enabling network security

D. Enhancing network resiliency

Customer 'A' has sites on 3 different Alcatel-Lucent PE routers. The routers are connected to each other through an IP/MPLS network in a full mesh fashion. Customer 'A' requires a VPLS service. Which of the following statements are TRUE? (Choose2)

A. Each router requires 1 VPLS service.

B. Each router requires 2 VPLS services.

C. Each router requires 1 SDP with 2 LSPs, one to each of the other 2 routers.

D. Each router requires 2 SDPs.

E. Each router requires 3 SDPs

Click the exhibit.

This is output from router R4. Service 333 is a VPLS. Why does peer 10.10.10.1 not have an EgrLbl?

A. The SDP to 10.10.10.1 on router R4 is shutdown.

B. Router R4 has not sent a label to router R1 (10.10.10.1) yet.

C. 10.10.10.1 has a different service MTU set.

D. 10.10.10.1 has not sent a label to router R4 yet.

Which protocol is used to signal the inner label for a L2-VPN service?

A. RSVP

B. IPCP

C. TLDP

D. PPP

E. Either RSVP or LDP

F. M-BGP

By default, what does the Alcatel-Lucent 7750 SR do when a frame with an unknown destination address is received in a VPLS?

A. It drops the frame.

B. It floods the frame to all PEs participating in the service.

C. It sends a destination unreachable message back to the originating host.

D. It sends the frame to the closest neighbor.

The SAP 1/1/1:2.3 receives an untagged Ethernet frame. Which of the following is TRUE?

A. The frame is dropped.

B. VLAN tags 2 and 3 are added to the frame.

C. Only outer VLAN tag 2 is added.

D. Only inner VLAN tag 3 is added.

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

A. 1

B. 2

C. 3

D. 4

E. 6

F. 7