question archive QUESTION 1 What is the magic number? QUESTION 2 Select the protocols below that provide a reliable connection

QUESTION 1 What is the magic number? QUESTION 2 Select the protocols below that provide a reliable connection

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QUESTION 1

What is the magic number?

QUESTION 2

Select the protocols below that provide a reliable connection.

LAP-F

TCP

IP

UDP

QUESTION 3

Select the protocols below that are connection oriented.

HDLC

IP

TCP

UDP

QUESTION 4

Select the protocols below that have no flow control.

HDLC

IP

TCP

UDP

QUESTION 5

The use of start and end flags allows data link layer frames ...

to be sent asynchronously

to not need zero bit insertion

to avoid using a length field

to be variable in size

QUESTION 6

Select the protocols below that do not offer error correction service ...

Frame-relay.

Internet Protocol.

Transmission Control Protocol.

Trivial File Transfer Protocol.

QUESTION 7

A frame relay frame arrives and the address field is 1101001001001011. Mark the statements below that are true regarding this frame.

This frame encountered congestion.

The frame tells the receiver it needs to slow its own transmission rate.

The sending station exceeded its CIR.

The receiver should notify the other end to slow down.

QUESTION 8

What value in base 5 is equivalent to the base 10 value of 376 (provide the number with no units, spaces, commas or decimal points in your answer)?

QUESTION 9

What is the data rate of the following system:  

 

The system sends sends a set of twp 7-bit ASCII characters as a block. The block is proceeded by 1 start bit. After the two character block there is 1 parity bit and 2 stop bits? The bit time for this system is 0.0000025 seconds per bit. 

 

Calculate your answer in bits per second but do not include commas, spaces, units or a decimal point in your answer. 

QUESTION 10

What is the percentage overhead for the following system:

 

The system sends three 7-bit ASCII characters together as a block. The block is proceeded by 1 start bit, then followed by 1 parity bit and 1 stop bit? 

 

The bit time for this system is 0.00032 seconds per bit.

Provide your answer as a percentage but  do not use the % symbol. Round the answer to exactly once place after the decimal point (yes you need a decimal point and one digit after the decimal point in this case). Do not provide any other type of units either.

QUESTION 11

For each item below, assign a layer from the five-layer Internet Model that the item primarily operates at.  [You are not required to use every layer shown and you will need to use some layers more often than others]

      -       A.       B.       C.       D.       E.    

Switch

      -       A.       B.       C.       D.       E.    

X.25 Packet Layer 

      -       A.       B.       C.       D.       E.    

TCP 

      -       A.       B.       C.       D.       E.    

ICMP 

      -       A.       B.       C.       D.       E.    

UDP

      -       A.       B.       C.       D.       E.    

Repeater 

      -       A.       B.       C.       D.       E.    

AMI Line Code 

      -       A.       B.       C.       D.       E.    

SLIP

A.

Layer 1 

B.

Layer 2 

C.

Layer 3 

D.

Layer 4 

E.

Layer 5 

QUESTION 12

Match the terms with their most appropriate option. 

      -       A.       B.       C.       D.       E.    

Delay Distortion

 

      -       A.       B.       C.       D.       E.    

Delay Spread

 

      -       A.       B.       C.       D.       E.    

Quantization Error

      -       A.       B.       C.       D.       E.    

Impulse Noise

 

      -       A.       B.       C.       D.       E.    

Interference

 

A.

Arrival of multiple components of a signal take more time than the transmission of those components. 

B.

A minor impairment to a signal introduced when it is converted from analog form to digital form. 

C.

Degradation of a signal that occurs when two consecutive signals overlap upon their arrival. 

D.

A signal impairment that results from the reception of another intended transmission at the same time. 

E.

Signal degradation that might be due to electromagnetic emanations from such sources as firing spark plugs or lightning strikes. 

 

QUESTION 13

Match the IP address and mask pairs with the appropriate descriptions.

      -       A.       B.       C.       D.    

IP Address 202.0.18.63 using mask 255.255.255.192

      -       A.       B.       C.       D.    

IP address 123.45.67.89 using mask 255.255.255.248 

      -       A.       B.       C.       D.    

IP Address 172.16.37.13 using mask 255.255.252.0 

      -       A.       B.       C.       D.    

IP Address 10.3.0.0 using mask 255.255.0.0 

A.

A host on the 9th useable subnet.

B.

A subnet broadcast address. 

C.

A subnet's network address.

D.

First useable host on the subnet.

 

QUESTION 14

What is the minimum size of an IPv4 datagram header in octets (not including body field)? 

 

(your answer should be an integer with no units, spaces, commas or even a decimal point)

2

QUESTION 15

Ethernet uses Manchester line code to send signals.

 True

 False

 

QUESTION 16

Determine the best match for the items below.

      -       A.       B.       C.    

Bit Substitution

      -       A.       B.       C.    

Bit Robbing

      -       A.       B.       C.    

Bit Stuffing

A.

Avoid false flags

B.

Avoid long strings of zeros

C.

Provide a channel for control signaling

QUESTION 17

What is the dotted decimal IP address for 00001010 00000111 11010001 10111011 (use dots, but no spaces in your answer)?

QUESTION 18

Convert the binary value of 00111101 to base 16 (Provide the base value with no units, spaces, commas or decimal points in your answer)?

 

QUESTION 19

What BINARY network mask would be used with a standard class A address (answer in binary with no dots or spaces, just a string of 32 binary digits)?

QUESTION 20

What type of IPv4 address is 172.16.10.0 when a class B mask is used?

A network address.

A host address.

A broadcast address.

A subnet mask.

QUESTION 21

What physical topology change would occur if you upgraded a LAN from 10BASE2 to 10BASE-T? 

Change from tree to star.

 

Change from star to bus.

 

Change from bus to star.

 

Change from star to tree.

 

Question 22

What network does the following host address belong to (no subnetting in this case):  

 

   10100100 00101011 11000011 11101010 

164.43.0.0

164.43.195.0

144.43.0.0

144.43.195.0

QUESTION 23

Which dotted decimal address below indicates a Class B IPv4 address with 7 bits borrowed that has host 100001010 on subnet 1000101?

 

 

172.20.28.20

172.20.39.20

172.20.28.10

172.20.39.10

QUESTION 24

The speed of light on a particular form of plastic fiber is 2.90 x 10^8 m/s.  A lightwave with 1,340 nm wavelength is sent down the fiber. What frequency would that be?

2.10 x 10^11 Hz

2.10 x 10^14 Hz

2.16 x 10^11 Hz

2.16 x 10^14 Hz

QUESTION 25

The 7-bit ASCII value for an upper case N with an EVEN parity bit added on the end is 11011101.

 True

 False

QUESTION 26

The maximum window size in TCP's sliding window scheme is: 

2^8 - 1 frames

2^16 - 1 frames

2^8 - 1 octets

2^16 - 1 octets

QUESTION 27

TCP uses ...

stop and wait flow control with stop and wait ARQ error control

stop and wait flow control with go back N ARQ error control

sliding window flow control with go back N ARQ error control

sliding window flow control with selective reject ARQ error control

QUESTION 28

An engineer has designed transmission equipment to transmit 7200 symbols per second while encoding 8 bits per symbol. If the signal to noise ratio is 400:1 and the channel bandwidth is 3625 Hz, has the engineer's design exceeded theoretical limits?

Yes, both the limit on symbol rate and the limit on bits per symbol have been exceeded.

Yes, but only the limit on symbol rate has been exceeded.

Yes, but only the limit on bits per symbol has been exceeded.

No, none of the theoretical limits have been exceeded.

QUESTION 29

Add B3ZS bit substitutions to the following data stream: 1000000001000011000.

What is the resulting +/- code?

+00000000-0000+-000

+-0-+0+00-00+0+--0- 

+00+-0-00-00-0+-+0+

+00+-0-00-00+0+-+0+

QUESTION 30

What is the minimum back off time for an ethernet line card that has experienced 9 collisions in a row?

0 micro seconds

51.5 micro seconds

26,316.5 micro seconds

26,368 micro seconds

52,684.5 micro seconds

52,736 micro seconds

55,684.5 micro seconds

QUESTION 31

The address field of a frame relay frame will always end with a binary 1.

 True

 False

QUESTION 32

What value is placed in an Ethernet Frames TYPE FIELD to indicate that an IP Datagram is contained inside the frame? Give your answer as a 16 bit binary value with no dots or spaces.

 

QUESTION 33

What four digit binary value will be in the version field of an IPv4 datagram header?

(provide a four digit binary value with no spaces or dots)

 

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