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6:  

Which of the following ISO level is more closely related to the physical communications facilities?

A. Appication
B. Session
C. Network
D. Data link
 
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Option: D

Explanation :

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7:  

 Which model shows how the network functions of a computer ought to be organized ?

A. ITU-T
B. OSI
C. ISO
D. ANSI
 
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Option: B

Explanation :
Open system interconnection model shows the network function of a computer developed by international standards organization.

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8:  

 Data link layer retransmits the damaged frames in most networks. If probability of a frame's being damaged is p, then what is the mean number of transmissions required to send a frame if acknowledgements are never lost ?

A.

K / K - P
B.

1 / K - P
C.

K / K(1 + p)
D.

p / K + 1
 
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Option: B

Explanation :

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9:  

Which of the following is a wrong example of network layer ?

A.

Internet protocol (I/P) ARPA NET 
B.

X.25 packet land protocols(PLP-ISO) 
C.

source routing and domains naming usenet
D.

X.25 level 2-ISO
 
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Option: D

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10:  

IEEE Project 802 divides the data link layer into which upper sublayer and which lower sublayer ?

A.

LLC, MAC
B.

MAC, LLC 
C.

PDU, HDLC
D.

HDLC, PDU 
 
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Option: A

Explanation :

IEEE project 802 divides the data link layer into two sub layer logical link control (LLC) and Medium access control (MAC).

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Syllabus covered in this section is-

  • ISO/OSI stack
  •  LAN technologies (Ethernet, Token ring)
  •  Flow and error control techniques
  •  Routing algorithms
  •  Congestion control
  •  TCP/UDP and sockets
  •  IP(v4)
  •  Application layer protocols (icmp, dns, smtp, pop, ftp, http)
  •  Basic concepts of hubs, switches, gateways  and router

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