Internet Protocols Flashcards
What does ARP stand for?
Address Resolution Protocol
What is the first step for the ARP protocol?
The requesting node sends an ARP query packet to broadcast address
What does the ARP query packet request?
Asks each node on the network if they have the required IP address.
Also contains the mac address of the requester
What is the third step for the ARP protocol?
The node that recognises its IP address sends its IP and mac addresses back.
What is the final step in the ARP protocol?
The requestor now knows the IP and mac address of the node and can begin to send packets to it.
The requestor remembers the address in an ARP table so it does not have to do this for that node again
What does DNS stand for?
Domain Name Server
What does DHCP stand for?
Dynamic Host Configuration Protocol
What does DHCP allow?
It allows the configuration of many nodes to be managed by a single server
What does a DHCP server do?
It manages a pool of IP addresses which can be allocated upon client request
Are addresses issued by DHCP servers permanent?
No - They are leased to a client
This means that the pool of addresses does not stagnate.
What is the first step in a client getting a DHCP address?
The client sends a DHCP discovery packet to broadcast address
Broadcast address is 255.255.255.255, UDP port 67
What is the second step in getting a DHCP address?
Server receives packet, allocates an address and sends an offer to client on UDP port 68
What is the third step in getting a DHCP address?
The client remembers the data and sends back a DHCP request as more than one server may reply
What is the fourth step in getting a DHCP address?
The server confirms the lease by returning a DHCP acknowledge packet
What is the final step in getting a DHCP address?
The client configures its network interface using the information that it remembered.
