Networking Chapter 18 Flashcards
Packetizing at the network layer involves ___________________________.
encapsulating the payload at the source
adds a header that contains the source and destination information
decapsulating the payload at the destination
Routers in the path are not allowed to ___________________________.
fragment the packet they receive
decapsulate the packet
change source or destination address
The network layer in the Internet provides _________________.
limited error control, but no flow control
In a virtual-circuit approach, the forwarding decision is based on the value of the _____________ field in the packet header.
label
In a datagram approach, the forwarding decision is based on the value of the _____________ field in the packet header.
destination address
The performance of a network can be measured in terms of ________.
delay, throughput, and packet loss
Transmission delay (time) is the ratio of______________________.
packet length to transmission rate
Propagation delay (time) is the ratio of______________________.
distance to propagation speed
When the load in the network reaches the network capacity, the packet delay ___________ and the network throughput reaches ______________.
increases sharply; its maximum
In open-loop congestion control, policies are applied ____________________.
to prevent congestion before it happens
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
D) None of the choices are correct
The__________________ technique is one of the close-loop congestion policies.
choke packet
An IPv4 address is normally represented in base ____ in dotted-decimal notation.
256
In classful addressing, the IPv4 address space is divided into _______ classes.
5
The number of addresses assigned to an organization in classless addressing _______.
must be a power of two
The first address assigned to an organization in classless addressing _______.
must be evenly divisible by the number of addresses in the organization
In subnetting, the number of addresses in each subnet must _______.
be a power of 2
What is the default prefix length for class A in CIDR notation?
8
What is the default prefix length for class B in CIDR notation?
16
What is the default prefix length for class C in CIDR notation?
24
DHCP is a (an) ___________ layer protocol.
application
In DHCP, the client uses ________ port and the server uses _________port.
a well-known; a well-known
DHCP uses the services of _______.
UDP
_________ 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.
NAT
