Data Communications Flashcards Section 2.6

What role does ARP play in the routing process?

Workstation2 needs to send data to Workstation3. It sends out an ARP request for the address of the default gateway. Which of the following are true of this request? (Select two.)

Routers use ARP to resolve known IP addresses into MAC addresses by broadcasting requests to the network.

What protocol can be used to discover the MAC address if a host does not know it?

Which destination address does Workstation1 put in the Ethernet frame header of the packet containing the text document?

Which destination MAC address does Workstation1 use when sending an IP packet containing a photograph to Workstation3?

When the packet reaches Workstation3, which source addresses are in the frame and packet? (Select two.)

When the packet leaves the router, which source and destination IP address will be contained in the IP packet? (Select two.)

Which default gateway address is used by Workstation2?

ARP in the Routing Process

ARP (Address Resolution Protocol) is crucial for routers to map IP addresses to MAC addresses.
When a router lacks a destination device's MAC address, it broadcasts an ARP request with the target IP address.

ARP Requests and Responses

An ARP request sent from one workstation will only receive a response from the designated router, confirming its MAC address.
The request can be relayed by a switch to other devices, such as Workstation1 and the router.

Address Resolution

Routers utilize ARP to convert known IP addresses into MAC addresses through network broadcasts.
This process is essential for routing data accurately across networks.

Discovering MAC Addresses

A host seeking to communicate with an IP address (e.g., 115.99.80.157) can employ ARP to identify the corresponding MAC address.

Ethernet Frame Headers

When sending data to another workstation, the originating workstation (e.g., Workstation1) includes the target’s MAC address (e.g., 080046987654) in the Ethernet frame header for proper delivery.

Source Information in IP Packets

When an IP packet reaches its destination (e.g., Workstation3), it contains specific source addresses that include:
- Source IP: 192.168.10.11
- Source MAC: 000b5f2a2223

IP Addressing Through Routers

In packet transmission routed by a device (e.g., Cisco 2600), key source and destination addresses are:
- Source IP: 192.168.11.11
- Destination IP: 192.168.10.11

Default Gateway Utilization

Workstation2 uses a specified default gateway address (192.168.10.1) to manage outbound packets toward other workstations.

Test your understanding of key concepts in data communications, focusing on ARP and routing processes. This set of flashcards will help you learn the roles and behaviors associated with ARP requests in a network environment.