cs610_spring2012_midterm_paper_13-05-2012

[Xpert]

Computer Networks – CS610

Spring 2012 – Mid Term

Umair Mehmood – bc100202129

Question 1:- If a computer had a power failure during the transmission of packet, then ………….. will be missed & transmission will be ……………..

· Eot, complete
· Soh incomplete
· Soh, complete
· Eot, incomplete

Question 2:- For a twisted pair Ethernet, we use …….. connecter & the operation will be on …………… based network.

• RJ-45, Thinnet
  
• AUI, Thicknet
  
• RJ-45, 10BASE-T
  
• BNC, 10BASE-5
  

Question 3:- Bridges work on ……….. layer(s).

• Network
  
• Data Link
  
• Transport & Physical
  
• None of these
  

Question 4:- Networks are ………. By size.

• 1
  
• 3
  
• 2
  
• 4
  

Question 5:- Most frequently, the …….. pair is treated as just a single connection identifier by computers.

• 21-bit
  
• 22-bit
  
• 23-bit
  
• 24-bit
  

Question 6:- …….. program sends a message to a remote computer and reports whether the computer responds.

• PING
  
• Trace Route
  
• ICMP
  
• None of these
  

Question 7:- CRC uses two hardware components that are…………… & …………..

• Shift Registers & NOR Unit
  
• NAND Unit & XOR Unit
  
• Shift Register & XOR Unit
  
• None of these
  

Question 8:- In Direct point-to-point communication, numbers of connections of for all computers can be determined with …….

• N-1
  
• (N^2-N)/2
  
• N^2
  
• None of these
  

Question 9:- Most LANs that employ ring topology use an access mechanism known as ……

• CSMA/CD
  
• CSMA/CA
  
• TOKEN PASSING
  
• None of the given
  

Question 10:- Fiber distributed data interconnect (FDDI) uses fiber optics between stations and transmits data at ……..

• 10 million bits per second
  
• 1000 million bits per second
  
• 100 million bits per second
  
• 3 million bits per second
  

Question 11:- In which category the hardware manufacturer assigns permanent physical address to each network interface?

• Static Addressing
  
• Dynamic Addressing
  
• Configurable Addressing
  
• None of these
  

Question 12:- The Ethernet that uses thin coaxial cable wiring is called ………… & sometimes known as ………….

• Thicknet,10BASE-2
  
• Thinnet,10BASE-5
  
• Thinnet, 10BASE-2
  
• Thicknet, 10BASE-T
  

Question 13:- NIC contains sufficient hardware to process data independent of system CPU; in which some NICs contain separate ………….

• Memory
  
• Cache
  
• CPU
  
• Microprocessor
  

Question 14:- A system with redundant bridges might have a problem with ………. in the system.

• Loop
  
• Filters[B][/B]
  
• Spanning Trees
  
• All given choices
  

Question 15:- ……….. [FONT=&quot]is used for typical data applications (where the data rate may be unknown and bursty) and allows use of whatever bandwidth is available at a given time.[/FONT]
[FONT=&quot] [/FONT]

• [FONT=&quot]ABR[/FONT]
  
• [FONT=&quot]VBR[/FONT]
  
• [FONT=&quot]CBR[/FONT]
  
• [FONT=&quot]UBR[/FONT]
  

[FONT=&quot] [/FONT]
Question 16:- ………… is used for audio and video, since these have predefined maximum data rates.

• ABR
  
• VBR
  
• CBR
  
• UBR
  

Question 17:- A network with throughput T and delay D has a total of ……….. bit in transit at any time.

• T / D
  
• T x D
  
• T + D
  
• None of the given
  

Question 18:- Delay among the packets can vary.

• True
  
• False
  

Question 19:- [FONT=&quot]Dividing data into small packets allow……...[/FONT]
[FONT=&quot] [/FONT]

• [FONT=&quot]FDM[/FONT]
  
• [FONT=&quot]TDM[/FONT]
  
• [FONT=&quot]WDM[/FONT]
  
• [FONT=&quot]PDM[/FONT]
  

[FONT=&quot] [/FONT]
[FONT=&quot]Question 20:- [/FONT][FONT=&quot]Formally named __________ informally known as the twisted pair Ethernet or TP Ethernet.[/FONT]
[FONT=&quot] [/FONT]

• [FONT=&quot]10Base-2[/FONT]
  
• [FONT=&quot]10Base-5[/FONT]
  
• [FONT=&quot]10Base-T[/FONT]
  
• [FONT=&quot]None of the given[/FONT]
  

[FONT=&quot] [/FONT]
[FONT=&quot]Question 21:- Describe the NIC’s functionality & responsibility. (2 marks)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Question 22:- Which attributes in ATM are used to make VPN? (2 marks)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Question 23:- Star organization is using four bridges in its network and they form a cycle. How can IT engineer avoid broadcasting from all bridge in this network? (3 marks)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Question 24:- A network admin continuously sending packets on a switch network. After some time, he faces a delay in his network. Identify the delay and write the mathematical equation. (3 marks)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Question 25:- There are two site officers A& B. Both are using VPN. If a user of other network wants to send some packets to A, then what will be the behavior of network A? How data can be protected in VPN? (5 marks)[/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot] [/FONT]
[FONT=&quot]Question 26:- In a single room computer lab, we have 8 computers. An I.T. officer wants to connect them with each other. Which Ethernet cable scheme will be used for this and why? (5 marks)[/FONT]