Checkpoint Exam: Communicating Between Networks Exam Answers

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

A computer has to send a packet to a destination host in the same LAN. How will the packet be sent?

• The packet will be sent to the default gateway first, and then, depending on the response from the gateway, it may be sent to the destination host.

• The packet will be sent directly to the destination host.

• The packet will first be sent to the default gateway, and then from the default gateway it will be sent directly to the destination host.

• The packet will be sent only to the default gateway.

A router receives a packet from the Gigabit 0/0 interface and determines that the packet needs to be forwarded out the Gigabit 0/1 interface. What will the router do next?

• route the packet out the Gigabit 0/1 interface

• create a new Layer 2 Ethernet frame to be sent to

  the destination

• look into the ARP cache to determine the destination IP

  address

• look into the routing table to determine if the destination

  network is in the routing table

Which IPv4 address can a host use to ping the loopback interface?

• 126.0.0.1

• 127.0.0.0

• 126.0.0.0

• 127.0.0.1

A computer can access devices on the same network but cannot access devices on other networks. What is the probable cause of this problem?

• The cable is not connected properly to the NIC.

• The computer has an invalid IP address.

• The computer has an incorrect subnet mask.

• The computer has an invalid default gateway address.

Which statement describes a feature of the IP protocol?

• IP encapsulation is modified based on network media.

• IP relies on Layer 2 protocols for transmission error control.

• MAC addresses are used during the IP packet encapsulation.

• IP relies on upper layer services to handle situations of missing or out-of-order packets.

Why is NAT not needed in IPv6?

• Any host or user can get a public IPv6 network address because the number of available IPv6 addresses is extremely large.

• IPv6 does not support private addressing.

• NAT is required for IPv6 to function properly.

• IPv6 addresses are not routable on the internet.

Which parameter does the router use to choose the path to the destination when there are multiple routes available?

• the lower metric value that is associated with the

  destination network

• the lower gateway IP address to get to the destination

  network

• the higher metric value that is associated with the

  destination network

• the higher gateway IP address to get to the destination

  network

What are two services provided by the OSI network layer?

• performing error detection

• routing packets toward the destination

• encapsulating PDUs from the transport layer

• placement of frames on the media

• collision detection

Within a production network, what is the purpose of configuring a switch with a default gateway address?

• Hosts that are connected to the switch can use the switch default gateway address to forward packets to a remote destination.

• A switch must have a default gateway to be accessible

  by Telnet and SSH.

• The default gateway address is used to forward

  packets originating from the switch to remote

  networks.

• It provides a next-hop address for all traffic that flows

  through the switch.