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4A0-100 Practice Exam Questions and Answers

Nokia Scalable IP Networks

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Total Questions : 352

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Question # 1

What happens in a TCP session if a segment is not acknowledged within a certain time period?

Options:

A.  

The missing segment is retransmitted.

B.  

The TCP session is terminated.

C.  

The sender sends the next segment.

D.  

An ICMP destination unreachable message is sent.

Discussion 0
Question # 2

Which of the following are considered Virtual Private Networks? Choose all that apply.

Options:

A.  

IES

B.  

VPWS

C.  

VPLS

D.  

VPRN

Discussion 0
Question # 3

What must occur before two hosts can exchange data using TCP?

Options:

A.  

Nothing. The two hosts can send data to each other at any time.

B.  

The two hosts must negotiate a path MTU to be used for the data exchange.

C.  

The two hosts must perform a 3-way handshake before transmitting data.

D.  

The two hosts must exchange encryption keys before transmitting data.

Discussion 0
Question # 4

The statement below describes which of the following activities?

"A set of tasks that moves a packet from its entry into an IP network to its exit from the IP network."

Options:

A.  

IP forwarding

B.  

IP decapsulation

C.  

IP encapsulation

D.  

IP tunneling

Discussion 0
Question # 5

Host A is transmitting data to host B on a TCP connection. What is the purpose of the ACK sent by host B?

Options:

A.  

The ACK tells the host A that host B wishes to establish a session.

B.  

The ACK tells host A the sequence number of the segment that was just received by host

B.  

C.  

The ACK tells host A the sequence number of the next segment that host B expects to see.

D.  

The ACK is flow control from host B and tells host A to reduce its transmission rate.

Discussion 0
Question # 6

Why does UDP have less overhead than TCP?

Options:

A.  

UDP has less overhead because it is only used for transmission of small amounts of data.

B.  

UDP has less overhead then TCP because there is no checksum field in UDP.

C.  

UDP overhead is the same as TCP because it uses the same fields in the header.

D.  

UDP has less overhead because there is no requirement for acknowledgment or retransmission.

Discussion 0
Question # 7

Which of the following statements is FALSE when describing a Virtual Private LAN Service?

Options:

A.  

A VPLS emulates a virtual switch or bridge.

B.  

The VPLS performs MAC learning on MAC addresses seen from SAPs and SDPs.

C.  

When a VPLS receives a frame with an unknown MAC destination, the frame will be dropped.

D.  

MAC addresses are maintained in a MAC address forwarding database (FDB).

Discussion 0
Question # 8

Question # 8

Based on the network diagram (click the Exhibit Button), what are the prefix, mask, and next-hop used on CR1 to setup a default static route to R1?

Options:

A.  

0.0.0.0/0 next-hop 10.2 3.2

B.  

0.0.0.0/32 next-hop 10.2.3.2

C.  

10.2.3.2/32 next-hop 0.0.0.0/0

D.  

0.0.0.0/0 next-hop 192.168.2.0

Discussion 0
Question # 9

How does LDP select the path used for an LSP?

Options:

A.  

LDP monitors the available bandwidth on all links and signals the LSP based on this information.

B.  

LDP uses the shortest hop-count between two endpoints for the LSP.

C.  

LDP must be configured hop-by-hop by the service provider.

D.  

LDP follows the path chosen by the IGP.

Discussion 0
Question # 10

The 201.148.26.0/24 network is subnetted using a /26 mask. How many subnets and host addresses will be obtained with this mask?

Options:

A.  

4 subnets, 64 hosts

B.  

64 subnets, 4 hosts

C.  

4 subnets, 62 hosts

D.  

64 subnets, 2 hosts

E.  

6 subnets, 30 hosts

Discussion 0
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