Checkpoint Exam: Modules 12,13,14

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

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 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

What are two functions of a router?

- A router connects multiple IP networks - It determines the best path to send packets

Which two functions are primary functions of a router?

- path selection - packet forwarding

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

The ARP table in a switch maps which two types of address together?

Layer 3 address to a Layer 2 address

What action does the ARP process take when a host needs to build a frame, but the ARP cache does not contain an address mapping?

The ARP process sends out an ARP request to the Ethernet broadcast address to discover the MAC address of the destination device

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

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

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