IP Addressing and Routing

Question 1

ARP

Answer 1

stands for Address Resolution Protocol and it dynamically learns the data link address of an IP host connected to a LAN

Question 2

If a device wants to communicate using TCP/IP, it needs …..

Answer 2

an IP address

Question 3

Another term for octet

Answer 3

Byte

Question 4

This must be true if all IP addresses are in the same group….

Answer 4

The IP addresses are not separated from each other by a router

Question 5

IP addresses separated from each other by a router must be ……

Answer 5

in different groups

Question 6

IPv4 Host Routing basics:

Answer 6

If the dest. IP address is in the same subnet, send directly to destination host; if not, send it to the default gateway

Question 7

Router forwarding logic basics

Answer 7

1. Use FCS field to ensure error free delivery
2. If frame has no errors, discard old header and trailer, exposing IP packet
3. Compare IP packet’s destination IP to the routing table
4. Encapsulate in new dll header and trailer

Question 8

Objectives of routing table

Answer 8

To dynamically learn and fill its table with a route to each subnet
Find the best routes
Manage and replace lost routes if available
Prevent routing loops

Question 9

Same general steps for learning routes

Answer 9

1. Each router adds a route to its table for each directly connected subnet
2. Informs neighbors about its routes; it also learns routes from other routers

Question 10

ARP Request

Answer 10

a message that asks the simple request “if this is your IP address, please reply with your MAC address.”

Question 11

ARP Reply

Answer 11

a message that lists both the original IP address and the matching MAC address

Question 12

ping

Answer 12

primary tool for testing basic network connectivity