Module 13 & 14 - The ARP Process & routing between networks Flashcards
(34 cards)
Which protocol is used in IPv4 networks to resolve a destination MAC address from a known IP address?
ARP (Address resolution protocol)
Which protocol does IPv6 use instead of ARP to perform address resolution?
ICMPv6 ND (Neighbor discovery)
Which address is used at Layer 2 for communication between two devices on the same Ethernet LAN?
MAC (Media Access Control) address
Which address is used at Layer 3 to route packets between networks?
IP (Internet Protocol)
Which MAC address is used as the destination in a Layer 2 frame if the target IP is on the same local network?
The MAC address of the destination device
Which MAC address is used as the destination when a host sends a packet to a remote network?
The MAC address of the hosts defualt gateway
Which process allows hosts to determine whether a destination IP is on the same local network?
Binary ANDing (comparing source IP and destination subnet mask)
Which element of the data link frame changes at each hop in a routed path?
The source and destination MAC addresses
Which destination MAC address is used in an Ethernet broadcast frame?
11-11-11-11-11-11 and ff-ff-ff-ff-ff-ff
Which network device receives Ethernet broadcasts but does not forward them to other networks?
A router
What is A network segment where all devices receive broadcasts sent by any host within the network?
A broadcast domain
What can happen when too many hosts are part of the same broadcast domain?
Excessive broadcast traffic
What does a host do if an IP-to-MAC mapping is not found in its ARP table?
Sends ARP request to the local network
How does a device respond to an ARP request if it owns the requested IP address?
Sends a ARP Reply with its MAC address to the requesting host
Why does an ARP request stay within the local network?
Routers do not forward broadcast traffic
What condition allows a host to send frames directly to another device without performing ARP again?
Having the destination MAC address already stored in its ARP table
Which protocol does IPv6 use instead of ARP to resolve MAC addresses?
ICMPv6 ND (Neighbor Discovery)
What must be true about all devices for ARP broadcasts to work correctly in an IPv4 network?
They must be within the same broadcast domain
What determines whether a packet should be sent directly to the destination or to a default gateway?
Whether the source and destination are on the same network
What must a host do if the destination IP is outside its local network?
It must send the packet to its default gateway
Which address does a host use as the destination MAC when sending to a remote network?
Destination MAC address of the default gateway
What does a host do when it knows the IP of the destination but not the MAC?
It checks its ARP cache, if not found it sends a ARP request
What is the role of the routing table on a router?
Stores network addresses and determines the best path (interface) to each network
How is the destination MAC determined when forwarding to a remote network?
The router checks its ARP cache, if not found it sends a ARP request
