question archive 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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