• Shuffle
    Toggle On
    Toggle Off
  • Alphabetize
    Toggle On
    Toggle Off
  • Front First
    Toggle On
    Toggle Off
  • Both Sides
    Toggle On
    Toggle Off
  • Read
    Toggle On
    Toggle Off
Reading...
Front

Card Range To Study

through

image

Play button

image

Play button

image

Progress

1/25

Click to flip

Use LEFT and RIGHT arrow keys to navigate between flashcards;

Use UP and DOWN arrow keys to flip the card;

H to show hint;

A reads text to speech;

25 Cards in this Set

  • Front
  • Back

Communication at the data-link layer is

node-to-node

Communication at the network layer is

host-to-host

An ARP request is normally

broadcast

An ARP reply is normally

unicast

Packet at the data-link layer is normally called a

frame

Data-link layer of a broadcast link has ___________sublayer(s).

two

Data-link layer of a point-to-point link has __________ sublayer(s).

one

3. How many IP addresses and how many link-layer addresses should a router have when it is connected to five links?

5 IP addresses and 5 link-layer addresses.

Do we need to always keep the ARP program running on a host or a router? Why?

Yes, because ARP need to listen the ARP broadcast.

Hub

is a repeater, bits coming in one link go out all other links

Switch

is link-layer device, and smarter than hubs, take active role, store,forward Ethernet frames

Router

is a network layer device, and smarter than switch, translate between different protocols.

Which error detection method involves polynomials?

CRC

In CRC, the quotient at the sender_______.

is discarded.

At the CRC checker, _______ means that the dataword is damaged.

a nonzero remainder

To detect five-bit errors, the Hamming distance between each pair ofcodewords should be at least_________.

6

To correct five-bit errors, theHamming distance between each pair of codewords should be at least_________.

11

A checksum can _________ errors.

both detect and correct

If 3 bits are used for the framesequence number in Go-Back-N ARQ, the size of the sender’s window Ssize canhave the following value (hint: 2^3 = 8)

5 frames

Considera Stop-and-Wait ARQ protocol that uses a time-out period of 18 ms(milliseconds). The round trip time between the sender and receiver is 10 ms. The transmission time of a frame is 2 ms. The value of the utilizationof this protocol in an error-free channel is

2/12

The timeout counter in the Go-Back-N ARQ protocol is used to

initiate frame retransmission

In Go-Back-N, the values of Sf = 3 and Sn = 7,after receiving a packet with ackNo = 6, the value of Sf is_______________.

6

Two methods used in separating one frame from the next

byte stuffing and bit stuffing

Two ARQ protocols in which the receiver has a buffer of size one frameare

Stop-and-Wait and Go-Back-N

Two ARQ protocols that use sliding window are

Go-Back-N and Selective Repeat