CCST - Checkpoint exam : Communication Between Networks

Question 1 Which type of address can be shared through NAT to enable home network devices to send and receive data over the internet? Answer choices: A. registered public IP address B. private IPv6 address C. broadcast MAC address D. registered MAC address

Correct answer: A A. registered public IP address

Question 2 What is the result if the default gateway address is misconfigured on a PC? Answer choices: A. The PC cannot communicate with any devices. B. The PC can communicate with devices both in remote networks and in the same network. C. The PC can communicate with devices in the same network but not with those in remote networks. D. The PC can communicate with devices in remote networks but not with those in the same network.

Correct answer: C C. The PC can communicate with devices in the same network but not with those in remote networks.

Question 3 When a LAN is connected to the internet using a wireless router, how do devices on the LAN communicate on the internet using NAT? Answer choices: A. Each device must wait to receive a token from the wireless router in order to communicate to the internet via NAT. B. Only a small group of high priority client devices can be chosen by the wireless router to communicate to the internet using NAT. C. All devices must share the single public IPv4 address assigned to the wireless router in order to communicate to the internet via NAT. D. Each LAN must select a single client device from the wireless router settings that can communicate to the internet via NAT.

Correct answer: C C. All devices must share the single public IPv4 address assigned to the wireless router in order to communicate to the internet via NAT.

Question 4 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? Answer choices: A. the private IP address assigned to the PC through DHCP B. a registered public IP address statically configured on the PC C. a registered public IP address assigned to the external router interface D. the broadcast IP address of the external network connecting to the ISP

Correct answer: C C. a registered public IP address assigned to the external router interface

Question 5 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? Answer choices: A. The IP address of the user is incorrectly configured. B. The address of the remote device is incorrect. C. The default gateway address is incorrect. D. TCP/IP is not installed on the host device.

Correct answer: C C. The default gateway address is incorrect.

Question 6 What will happen if the default gateway address is incorrectly configured on a host? Answer choices: A. The host cannot communicate with other hosts in the local network. B. The switch will not forward packets initiated by the host. C. The host will have to use ARP to determine the correct address of the default gateway. D. The host cannot communicate with hosts in other networks. E. A ping from the host to 127.0.0.1 would not be successful.

Correct answer: D D. The host cannot communicate with hosts in other networks.

Question 7 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? Answer choices: A. The ARP process sends out an ARP request to the Ethernet broadcast address to discover the IPv4 address of the destination device. B. The ARP process sends out an ARP request to the IPv4 broadcast address to discover the MAC address of the destination device. C. The ARP process sends out an ARP request to the IPv4 broadcast address to discover the IPv4 address of the destination device. D. The ARP process sends out an ARP request to the Ethernet broadcast address to discover the MAC address of the destination device.

Correct answer: D D. The ARP process sends out an ARP request to the Ethernet broadcast address to discover the MAC address of the destination device.

Question 8 Which protocol is used by a computer to find the MAC address of the default gateway on an Ethernet network? Answer choices: A. ARP B. TCP C. UDP D. DHCP

Correct answer: A A. ARP

Question 9 Exhibit: Hosts A, B, and C connect to a switch attached to R1. R1 connects to R2, which connects through another switch to host D. 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? Answer choices: A. only host D B. only router R1 C. only hosts A, B, and C D. only hosts A, B, C, and D E. only hosts B and C F. only hosts B, C, and router R1

Correct answer: F F. only hosts B, C, and router R1

Question 10 Which destination address is used in an ARP request frame? Answer choices: A. 0.0.0.0 B. 255.255.255.255 C. FFFF.FFFF.FFFF D. AAAA.AAAA.AAAA E. the physical address of the destination host

Correct answer: C C. FFFF.FFFF.FFFF

Question 11 What is the purpose of ARP in an IPv4 network? Answer choices: A. to forward data onward based on the destination IP address B. to obtain a specific MAC address when an IP address is known C. to forward data onward based on the destination MAC address. D. to build the MAC address table in a switch from the information that is gathered

Correct answer: B B. to obtain a specific MAC address when an IP address is known

Question 12 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? Answer choices: A. the unicast IP address of the remote host B. the unicast MAC address of the remote host C. the subnet broadcast IP address D. the broadcast MAC address

Correct answer: D D. the broadcast MAC address

Question 13 Launch the PT activity. What is the MAC address of the default gateway for PC0? Answer choices: A. 0002.4A83.A602 B. 0060.5C55.7401 C. 0060.70DE.3192 D. 00D0.FF0D.A02B

Correct answer: B B. 0060.5C55.7401

Question 14 Exhibit: One router connects Network 1 to Network 2. 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? Answer choices: A. It sends the frame with the same information as it was received. B. It reassembles the frame with different MAC addresses than the original frame. C. It reassembles the data packet with different IP addresses than the original data packet. D. It reassembles both the packet and the frame with different destination IP and MAC addresses.

Correct answer: B B. It reassembles the frame with different MAC addresses than the original frame.

Question 15 Which two functions are primary functions of a router? (Choose two.) Answer choices: A. packet forwarding B. MAC address assignment C. domain name resolution D. path selection

Correct answers: A D A. packet forwarding D. path selection

Question 16 When a router receives a packet, what information must be examined in order for the packet to be forwarded to a remote destination? Answer choices: A. destination MAC address B. source IP address C. destination IP address D. source MAC address

Correct answer: C C. destination IP address

Question 17 Which portion of the network layer address does a router use to forward packets? Answer choices: A. host portion B. broadcast address C. network portion D. gateway address

Correct answer: C C. network portion

Question 18 Why is it important for the router to maintain an accurate routing table? Answer choices: A. to provide Layer 2 addressing information for the next hop B. to prevent broadcasts from occurring on the LAN C. to determine the best path to reach the destination network D. to identify all of the routers in a large network

Correct answer: C C. to determine the best path to reach the destination network

Question 19 Exhibit: Workstation A connects to workstation B through four routers in series. 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.) Answer choices: A. The Layer 2 header is stripped from the frame when it is received by each router. B. The destination Layer 2 address of the frame does not change as it is forwarded. C. The source Layer 3 address is changed when it is received at each router. D. The Layer 2 header of the frame is reassembled when it is forwarded by each router. E. The Layer 3 header is stripped from the packet when it is received at each router.

Correct answers: A D A. The Layer 2 header is stripped from the frame when it is received by each router. D. The Layer 2 header of the frame is reassembled when it is forwarded by each router.

Question 20 Exhibit: PC1 (192.168.1.95/24; gateway 192.168.1.254) connects through Switch1 to Router1, then an Internet cloud, Router2, Switch2, and PC2. Refer to the exhibit. Consider the IP address configuration shown from PC1. What is a description of the default gateway address? Answer choices: A. It is the IP address of the Router1 interface that connects the company to the Internet. B. It is the IP address of the Router1 interface that connects the PC1 LAN to Router1. C. It is the IP address of Switch1 that connects PC1 to other devices on the same LAN. D. It is the IP address of the ISP network device located in the cloud.

Correct answer: B B. It is the IP address of the Router1 interface that connects the PC1 LAN to Router1.