The network layer Addressing and routing

1

The network layer

Addressing and routing

1. Mobility and addressing

1. What is the DHCP protocol used for?

Assign IP addresses and network conguration of automatic way.

2. What are the advantages of DHCP in comparison with a manual configuration?

Disadvantages of manual conguration:

(A) it is possible to assign an IP address has two different stations,

(B) to err in the conguration (subnet mask, network, default gateway)

(C) generates a high administrative burden in case of "nomadic" users.

Benefits of DHCP server provides all the information conguration TCP / IP with the

customer. The user no longer needs to visit his administrator for information on its

conguration

3. What is the difference between DHCP and the BOOTP or RARP protocols?

DHCP is based on BOOTP and maintains some backward compatibility. The main

difference is that BOOTP was designed for manual pre-conguration of the host

information in a server database, while DHCP allows for dynamic allocation of network

addresses and congurations to newly attached hosts. Additionally, DHCP allows for

recovery and reallocation of network addresses through a leasing mechanism. RARP is a

protocol used by Sun and other vendors that allows a computer to find out its own IP

number, which is one of the protocol parameters typically passed to the client system by

DHCP or BOOTP. RARP doesn’t support other parameters and using it, a server can only

serve a single LAN. DHCP and BOOTP are designed so they can be routed.

4. What is the Client ID used for?

What is termed the Client ID for the purposes of the DHCP protocol is whatever is

used by the protocol to identify the client computer. By default, DHCP implementations

typically employ the client’s MAC address for this purpose, but the DHCP protocol

allows other options. Some DHCP implementations have a setup option to specify the

client ID you want. One alternative to the MAC address is simply a character string of

your choice. In any case, in order for DHCP to function, you must be certain that no other

client is using the client ID you choose, and you must be sure the DHCP server will accept

it.

5. What are the four phases necessary so that a customer DHCP obtains a configuration of a

DHCP server?

(A) Dissemination of IP lease request

(B) Dissemination of a proposed lease IP server in response to the request

(C) The customer selects a lease that suits him (Sending a message to request a rental

lease)