Self-Assessment Quizzes Chapter 5 MC,T&F

*1.

A channel partitioning protocol has which of the following characteristics:

there is no master node
all transmitting nodes get the same amount of bandwidth
it does not generate collisions
all of the above

*2.

In slotted ALOHA with N active nodes, the probability that no node transmits in a given slot is

(1-p)N
(1-p)^N
p^N
1-p

*3.

An ARP query packet is encapsulated in

an IP datagram
a link-layer frame addressed to a specific adapter
a link-layer broadcast frame
none of the above

*4.

Ethernet provides which of the following services to the network layer

error detection
flow control
reliable data transfer
all of the above

*5.

For Ethernet, if an adapter determines that a frame it has just received is addressed to a different adapter

it discards the frame and sends an error message to the network layer
it discards the frame without sending an error message to the network layer
it delivers the frame to the network layer, and lets the network layer decide what to do
it sends a NACK (not acknowledged frame) to the sending host

*6.

In the Ethernet CSMA/CD protocol, suppose a node constructs a frame and then senses the channel as busy. Then

the adapter enters exponential backoff.
the adapter waits until it senses the channel idle and then begins to transmit the frame.
the adapter begins to transmit the frame.
none of the above

*7.

In CSMA/CD, after the 3rd collision, what is the probability that the value of K that a node chooses is 2?

0
.25
.33
.125

*8.

When a switch transmits an Ethernet frame, the Ethernet frame has

the swtitch's LAN address for its source address
the swtitch's LAN address for its destination address
the broadcast address for the its source address
none of the above

*9.

The switch poisoning attack involves:

sending many packets to the switch with different bogus source IP addresses
sending many packets to the switch with different bogus destination IP addresses
sending many packets to the switch with different bogus source MAC addresses
sending many packets to the switch with different bogus destination MAC addresses

*10.

All link layer protocols that support IP have the same frame structure (i.e., length of frame, number and length of header fields).

True
False

*11.

CRC error detection, as used in Ethernet, is always able to detect whether there is an error in a frame.

True
False

*12.

The even parity bit scheme can correct single bit errors.

True
False

*13.

With CDMA, each sender uses the same code, Cm, m=1,...,M.

True
False

*14.

Each LAN adapter has a unique LAN address.

True
False

*15.

Consider a router with multiple ARP tables, one for each of its interfaces. No two of these ARP tables can contain the same LAN address.

True
False

*16.

Consider a twisted-pair Ethernet in which all nodes are 50 meters from the hub. The time it takes for a bit to propagate from hub to node for a 10BaseT Ethernet is ten times longer then for a 100BaseT Ethernet.

True
False

*17.

The entries in a switch table need to be configured by the network administrator.

True
False

*18.

Consider the switched LAN architecture in Figure 5.24. Assuming all links are full duplex, there are never collisions in this LAN.

True
False