Nokia Nokia Certifications 4A0-100 Questions & Answers

• Question 211:

  What is the purpose of the source and destination ports in the TCP header?

  A. These ports identify the physical location of the sender and the receiver on the IP router.

  B. These ports are used as addresses to communicate with the IP layer.

  C. TCP does not use source or destination ports.

  D. These ports are used as an address to identify the upper layer application using the TCP connection.

  Correct Answer: D

• Question 212:

  Host A receives a TCP SYN/ACK segment. What does this signify?

  A. Host A has received a request to establish a TCP session.

  B. Host A has received a request to close a TCP session

  C. A TCP session is now established to host A.

  D. The TCP session has been terminated due to a timeout.

  Correct Answer: C

• Question 213:

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

  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.

  Correct Answer: C

• Question 214:

  Which of the following is NOT a function of TCP?

  A. Maintaining the ordering of data transmitted across the network.

  B. Ensuring the reliable transmission of data across the network.

  C. Providing the receiver with a flow control mechanism.

  D. Defining the method for routing data across the network.

  Correct Answer: D

• Question 215:

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

  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.

  Correct Answer: C

• Question 216:

  Which of the following statements describes the purpose of the Transport Layer in the TCP/IP stack?

  A. Provides a data transport service to higher protocol layers.

  B. Provides a data transport service for routing and control protocols such as OSPF and ICMP.

  C. Provides a universal address plan to uniquely identify every device in the network.

  D. Defines a standard method for framing data for transmission on the physical network medium.

  Correct Answer: A

• Question 217:

  In the diagram, what type of BGP session is established between the routers of AS 65001 and AS 2002?

  

  A. IGP

  B. IBGP

  C. EBGP

  D. EGP

  E. BGP cannot be run between routers in different ASs.

  Correct Answer: C

• Question 218:

  In the diagram, what type of BGP session is established between the routers of AS 2002?

  

  A. IGP

  B. IBGP

  C. EBGP

  D. EGP

  E. BGP cannot be run between routers in the same AS.

  Correct Answer: B

• Question 219:

  What are some of the characteristics of BGP? Choose three

  A. BGP is an exterior gateway protocol.

  B. BGP routing is based on distance vector.

  C. BGP sends periodic updates to its neighbors.

  D. A router running BGP protocol needs an Autonomous system number

  Correct Answer: ABD

• Question 220:

  Which is the public AS in the diagram?

  

  A. 65001

  B. 65003

  C. 2002

  D. All of the above.

  E. None of the above.

  Correct Answer: C