#4 Checkpoint Exam: Communication Between Networks
Which protocol is used by a computer to find the MAC address of the default gateway on an Ethernet network?
ARP
When a LAN is connected to the internet using a wireless router, how do devices on the LAN communicate on the internet using NAT?
All devices must share the single public IPv4 address assigned to the wireless router in order to communicate to the internet via NAT.
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF
Refer to the exhibit. Consider the IP address configuration shown from PC1. What is a description of the default gateway address?
It is the IP address of the Router1 interface that connects the PC1 LAN to Router1.
Refer to the exhibit. What does the router do after it determines that a data packet from Network 1 should be forwarded to Network 2?
It reassembles the frame with different MAC addresses than the original frame.
The ARP table in a switch maps which two types of address together?
Layer 3 address to a Layer 2 address
Refer to the exhibit. Workstation A sends an IP packet to workstation B. Which two statements describe the encapsulation of the packet as it passes through the network? (Choose two.)
The Layer 2 header is stripped from the frame when it is received by each router, The Layer 2 header of the frame is reassembled when it is forwarded by each router.
What is the result if the default gateway address is misconfigured on a PC?
The PC can communicate with devices in the same network but not with those in remote networks.
A network administrator investigates a user problem. The user can reach hosts on the same network, but is unable to communicate to remote networks.The network administrator tries to ping the gateway address configured on the host device and is unsuccessful. What is the most likely cause of the problem?
The default gateway address is incorrect.
What will happen if the default gateway address is incorrectly configured on a host?
The host cannot communicate with hosts in other networks.
A home network is using NAT on the router connecting it to the internet. The PCs on the home network receive private IP addresses through DHCP. When a PC sends a packet to a web server on the internet, what is the source IP address in the packet header when it arrives at the web server?
a registered public IP address assigned to the external router interface
When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination?
destination IP address
Which portion of the network layer address does a router use to forward packets?
network portion
Refer to the exhibit. The switches have a default configuration. Host A needs to communicate with host D, but host A does not have the MAC address for the default gateway. Which network devices will receive the ARP request sent by host A?
only hosts B, C, and router R1
Which two functions are primary functions of a router? (Choose two.)
packet forwarding, path selection
Which type of address can be shared through NAT to enable home network devices to send and receive data over the internet?
registered public IP address
A host needs to reach another host on a remote network, but the ARP cache has no mapping entries. To what destination address will the host send an ARP request?
the broadcast MAC address
Why is it important for the router to maintain an accurate routing table?
to determine the best path to reach the destination network
What is the purpose of ARP in an IPv4 network?
to obtain a specific MAC address when an IP address is known
