14.4.3 Routing Between Networks Quiz Answers. Networking Basics Module 14 quiz exam answers
1. Which information is used by routers to forward a data packet toward its destination?
- source IP address
- destination IP address
- source data-link address
- destination data-link address
Explanation: The destination IP address is the IP address for the receiving device. This IP address is used by routers to forward the packet to its destination.
2. If the default gateway is configured incorrectly on the host, what is the impact on communications?
- The host is unable to communicate on the local network.
- The host can communicate with other hosts on the local network, but is unable to communicate with hosts on remote networks.
- The host can communicate with other hosts on remote networks, but is unable to communicate with hosts on the local network.
- There is no impact on communications.
Explanation: A default gateway is only required to communicate with devices on another network. The absence of a default gateway does not affect connectivity between devices on the same local network.
3. What role does a router play on a network?
- forwarding Layer 2 broadcasts
- forwarding frames based on a MAC address
- selecting the path to destination networks
- connecting smaller networks into a single broadcast domain
Explanation: When a computer sends a packet onto the network, the packet includes a source and destination IP address. Routers use the destination IP address in a packet to forward the packet to the correct destination network.
4. Which address should be configured as the default gateway address of a client device?
- the Layer 2 address of the switch management interface
- the Layer 2 address of the switch port that is connected to the workstation
- the IPv4 address of the router interface that is connected to the same LAN
- the IPv4 address of the router interface that is connected to the internet
Explanation: The default gateway is used when a host needs to send messages to destinations that are located in remote networks. The default gateway address is configured on the host with the IPv4 address of the router interface that is connected to the same local network as the host.
5. Which device is used to transfer data from one IP local network to a remote network?
- NIC card
- switch
- router
- server
Explanation: A router is a networking device that connects multiple IP networks. Routing is the process of identifying the best path from one network to another remote network.
6. Refer to the exhibit. To allow IP communication between the two separate networks, what type of device is required?
- server
- router
- switch
- access point
Explanation: Routers enable communications between two or more different IP networks. Servers, switches, and access points are devices attached to a local IP network.
7. What is a benefit of adding a router within an IP network?
- increases the size of the local network
- keeps broadcasts contained within a local network
- reduces the number of hosts that can connect to the network
- controls host-to-host traffic within a single local network
Explanation: Routers can divide or segment a network. Because routers do not forward broadcasts they can keep broadcasts isolated to the local network.
8. Refer to the exhibit. Host H7 sends a packet with the destination IP address of 255.255.255.255. What does router R1 do when it receives the packet from host H7?
- examines the packet received on interface FastEthernet0/1 and does not forward the packet
- changes the Layer 2 header information and forwards the packet out all connected interfaces
- checks the routing table and forwards the packet out interface FastEthernet0/0
- changes the destination IP address and forwards the packet out interface FastEthernet0/0
Explanation: The IP address of 255.255.255.255 is a broadcast address. Routers do not forward broadcasts to other networks. Router R1 examines the header of the packet to determine if the destination IP address is on another network or is a broadcast.
9. What action will a router take when it receives a frame with a broadcast MAC address?
- It will not forward the frame to another network.
- It forwards the frame back to the sending host.
- It forwards the frame out of all connected interfaces.
- It forwards the frame back out the receiving interface.
Explanation: Routers do not forward broadcasts to other networks. Routers examine broadcasts to determine if they need to act on the broadcast, such as an ARP request or a DHCP DISCOVER message. If the router does not need to respond to the broadcast, it is dropped.
10. What are two reasons to install routers to segment a network? (Choose two.)
- to limit the number of devices that can connect to the network
- to expand the network to a different geographic location
- to create smaller broadcast domains within the network
- to reduce the number of switches needed to connect devices
Explanation: There are a number of reasons to use routers to divide a network into smaller segments. Expanding the network into a different geographic location may require the use of routers at both locations. Another reason is to limit broadcasts that must be processed by all devices on the network segment. Routers do not forward broadcast traffic off the local network segment.
11. Which table does a router use to determine which interface to use to send packets to the destination network?
- ARP table
- routing table
- network table
- forwarding table
Explanation: Routing tables contain the addresses of networks, and the best path to reach those networks. Routers use the routing tables to determine which interface to use to forward a message to its intended destination.
12. What action does the router take when it does not find a route to the destination network in its routing table?
- It drops the packet.
- It sends the packet as a broadcast.
- It returns the packet to the sender.
- It sends the packet out all connected interfaces.
Explanation: When there is no route to the destination network contained in the routing table, the router drops the packet.