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
The idea of address aggregation was designed to alleviate the increase in routing table entries when using ________ addressing.
classless
The use of hierarchy in routing tables can ________ the size of the routing tables.
reduce
