Index

COMPUTER NETWORKING

  1. INTRO
    1. TCP/IP Five Layer Model
    2. NETWORKING DEVICES
    3. PHYSICAL LAYER
    4. DATALINK LAYER
  2. NETWORK LAYER
    1. IP
    2. SUBNET
    3. ROUTING
  3. TRANSPORT & APPLICATION LAYER
    1. TRANSPORT LAYER
    2. CONTROL FLAGS
    3. APPLICATION LAYER
    4. ALL TOGETHER
  4. NETWORK SERVICES
    1. DNS - NAMES RESOLUTION
    2. DHCP
    3. NAT
    4. VPN
  5. CONNECTING TO INTERNET
    1. BROADBAND
    2. WAN
    3. WIRELESS NETWORKING
  6. TROUBLESHOOTING
  7. MORE ABOUT
    1. DNS
    2. IPv6
    3. CLOUD

DHCP

Dynamic Host Configuration Protocol

Subnet mask, Gateway, Name Server are same for all devices in the connected network.
Only IP addresses change.

• DHCP is an application layer protocol that automatesthe configuration process of hosts on a network.

DHCP DYNAMIC ALLOCATION:Most Common.
A range of IP addresses is set aside for client devices and one of these IPs is issued to these devices when they request.

AUTOMATIC ALLOCATION. —The DHCP server assigns a permanent IP address to a client from its.
FIXED ALLOCATION : requires a manually specified list of MAC address and their corresponding IPs

DHCP can be used for even NTP servers. Network Time Protocol servers: Used to keep all computers on a network synchronized in time.

DHCP DISCOVERY : The process by which a client configured to use DHCP attempts to get network configuration information.
1.DHCP DISCOVER : requests for network configuration info
images/14-1.png
2. DHCP OFFER : Examines and offers to give it an IP
images/14-2.png
3. DHCP REQUEST : Local machine requests for an IP
images/14-3.png
4. DHCP ACK :acknowledgement
images/14-4.png
5. DHCP lease : includes an expiration