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Q57. To transmit its segments of data across the network TCP uses the services of which layer? 

A. Application Layer. 

B. Transport Layer. 

C. IP Layer. 

D. Data Link Layer 

Answer: C 


Q58. Which statement best describes how the internet evolved? 

A. The internet emerged in the commercial world in the 1980’s following the US military’s adoption of TCP/IP in 1983. 

B. The internet evolved from a military to a research to a commercial based network. 

C. The internet remained primarily a research based network and was only commercially adopted in 2000 when the world wide web was conceived. 

D. Internet service providers provided the services necessary for military based networks to evolve into research and education based networks. 

Answer: B 


Q59. In the diagram, R3 receives an LSA with sequence number 112 from R7 and installs it in its link state database. 10 ms. Later it receives a copy of the same LSA with a sequence number of 111 from R1. What does R3 do with the LSA from R1? 

A. R3 discards the LSA received from R1 and sends a copy of the LSA from its link state base to R1. 

B. R3 installs the LSA received from R1 in its link state database and floods a copy to its neighbors. 

C. R3 discards the LSA received from R1 and sends an ACK to R1. 

D. R3 installs the LSA received from R1 in its link state database, sends an ACK to R1 and floods a copy to its neighbors. 

Answer: A 


Q60. Which organization first considered cross-platform networking support to be a necessity? 

A. IBM. 

B. US Military. 

C. Alcatel-Lucent. 

D. NASA. 

E. Bell Labs 

Answer: B 


Q61. Which of the following describes the normal sequence of events in the forming of an OSPF adjacency? 

A. Hello exchange, DB descriptor exchange, Link state requests and updates. 

B. DB descriptor exchange, Link state requests and updates, Hello exchange. 

C. Link state requests and updates, Hello exchange, DB descriptor exchange. 

D. Hello exchange, Link state requests and updates, DB descriptor exchange. 

Answer: A 


Q62. What happens next after an incoming packet is de-encapsulated from the Layer 2 frame in an Alcatel-Lucent 7750 router? 

A. The IP datagram is encapsulated in the appropriate Layer 2 frame by the MDA. 

B. The IP datagram passes through the switch fabric to reach the egress IOM. 

C. The IP datagram is passed to the IOM. 

D. A lookup is performed in the FIB to determine the egress interface. 

Answer: C 


Q63. TCP is sending data in 5 segments with SEQ numbers 27000, 27500.28000, 28500, and 29000 respectively. During transmission, the segment with SEQ=28500 is dropped in the network. How does TCP handle this situation? 

A. The receiving end station sends an ACK flag with SEQ=28000 to indicate it has received a segment out of order. 

B. The receiving station sends a NACK frame with SEQ=28500 requesting that the frame be retransmitted 

C. Once the reciever's window is full. TCP assembles the payload and determines that SEQ=28500 is missing. At this point, the reciever sends the RST flag with SEQ=28500 to Request Single Transmission of the missing segment. 

D. TCP will collect the segments and forward them to the application layer where the SEQ numbers will be processed and a retransmit request will occur for the entire packet. 

Answer: C 


Q64. Which of the following statements is TRUE regarding the development of the OSI Reference Model? 

A. OSI was developed as an alternative, open standard to IBMs SNA model. 

B. OSI protocols were no longer used after TCP/IP was developed. 

C. OSI model is much simpler than TCP/IP. 

D. OSI model is maintained exclusively by the IETF. 

Answer: A