Networking Chapter 18 Flashcards

1
Q

Packetizing at the network layer involves ___________________________.

A

encapsulating the payload at the source

adds a header that contains the source and destination information

decapsulating the payload at the destination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Routers in the path are not allowed to ___________________________.

A

fragment the packet they receive
decapsulate the packet
change source or destination address

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The network layer in the Internet provides _________________.

A

limited error control, but no flow control

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

In a virtual-circuit approach, the forwarding decision is based on the value of the _____________ field in the packet header.

A

label

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

In a datagram approach, the forwarding decision is based on the value of the _____________ field in the packet header.

A

destination address

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The performance of a network can be measured in terms of ________.

A

delay, throughput, and packet loss

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Transmission delay (time) is the ratio of______________________.

A

packet length to transmission rate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Propagation delay (time) is the ratio of______________________.

A

distance to propagation speed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

When the load in the network reaches the network capacity, the packet delay ___________ and the network throughput reaches ______________.

A

increases sharply; its maximum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

In open-loop congestion control, policies are applied ____________________.

A

to prevent congestion before it happens

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

The __________________ technique is one of the open-loop congestion policies.
A) backpressure
B) choke packet
C) implicit signaling
D) None of the choices are correct

A

D) None of the choices are correct

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

The__________________ technique is one of the close-loop congestion policies.

A

choke packet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

An IPv4 address is normally represented in base ____ in dotted-decimal notation.

A

256

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

In classful addressing, the IPv4 address space is divided into _______ classes.

A

5

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The number of addresses assigned to an organization in classless addressing _______.

A

must be a power of two

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

The first address assigned to an organization in classless addressing _______.

A

must be evenly divisible by the number of addresses in the organization

17
Q

In subnetting, the number of addresses in each subnet must _______.

A

be a power of 2

18
Q

What is the default prefix length for class A in CIDR notation?

A

8

19
Q

What is the default prefix length for class B in CIDR notation?

A

16

20
Q

What is the default prefix length for class C in CIDR notation?

A

24

21
Q

DHCP is a (an) ___________ layer protocol.

A

application

22
Q

In DHCP, the client uses ________ port and the server uses _________port.

A

a well-known; a well-known

23
Q

DHCP uses the services of _______.

A

UDP

24
Q

_________ allows a site to use a set of private addresses for internal communication and a set of global Internet addresses for communication with the rest of the world.

A

NAT

25
Q

The idea of address aggregation was designed to alleviate the increase in routing table entries when using ________ addressing.

A

classless

26
Q

The use of hierarchy in routing tables can ________ the size of the routing tables.

A

reduce