Networking Basics 12 - 14 QUIZ
What are two functions of a router? (Choose two.)
It determines the best path to send packets. A router connects multiple IP networks.
The ARP table in a switch maps which two types of address together?
Layer 3 address to a Layer 2 address
Which type of address can be shared through NAT to enable home network devices to send and receive data over the internet?
Network address translation (NAT) implemented on the home network router enables privately addressed devices to share a registered public IP address that can be routed over the internet.
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?
On a home router, NAT converts the source address in the IP packet from the internal private IP address to a registered public IP address assigned to the external interface on the router before sending it out over the internet.
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
Which protocol is used by a computer to find the MAC address of the default gateway on an Ethernet network?
ARP
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?
ARP requests are sent when a host does not have an IP to MAC mapping for a destination in the ARP cache. ARP requests are sent to the Ethernet broadcast of FF:FF:FF:FF:FF:FF. In this example because the address of the remote host is unknown, an ARP request is sent to the Ethernet broadcast to resolve the MAC address of the default gateway that is used to reach the remote host.
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
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.
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 address resolution protocol (ARP) maintains a cache of MAC to IPv4 address mappings on the local computer. If there is no mapping in the cache for a specific IPv4 address, then the ARP process sends an Ethernet broadcast on the local link in an attempt to resolve the destination IPv4 address to a MAC address.
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 used to forward packets to remote networks. The IP address of the host must be correct because the user can reach other hosts on the same network. The TCP/IP protocol stack is correct because of verified communication to hosts on the same network. The end device could be incorrectly configured, but the most likely cause of the issue is a wrong address for the default gateway.
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 two functions are primary functions of a router? (Choose two.)
path selection packet forwarding
