ITN Final exam 5 of 5

Which statement describes a feature of an IPv4 routing table on a router?

• Directly connected interfaces will have two route source codes in the routing table: C and S .

• If there are two or more possible routes to the same destination, the route associated with the higher metric value is included in the routing table.

• The netstat -r command can be used to display the routing table of a router.​

• The routing table lists the MAC addresses of each active interface.

• It stores information about routes derived from the active router interfaces.

Answer explanation

The show ip route command is used to display the routing table of the router. In IPv4, directly connected interfaces will have one source code:C. The routing table stores information about directly connected routes and remote routes. An entry in the routing table with a source code of S is included if a default static route is configured on the router.

Which statement describes a feature of an IPv4 routing table on a router?

• Directly connected interfaces will have two route source codes in the routing table: C and S .

• If there are two or more possible routes to the same destination, the route associated with the higher metric value is included in the routing table.

• The netstat -r command can be used to display the routing table of a router.​

• The routing table lists the MAC addresses of each active interface.

• If a default static route is configured in the router, an entry will be included in the routing table with source code S

Answer explanation

The show ip route command is used to display the routing table of the router. In IPv4, directly connected interfaces will have one source code:C. The routing table stores information about directly connected routes and remote routes. An entry in the routing table with a source code of S is included if a default static route is configured on the router.

What characteristic describes a VPN?

• software on a router that filters traffic based on IP addresses or applications

• software that identifies fast-spreading threats

• a tunneling protocol that provides remote users with secure access into the network of an organization

• a network device that filters access and traffic coming into a network

Why would a Layer 2 switch need an IP address?

• to enable the switch to send broadcast frames to attached PCs

• to enable the switch to function as a default gateway

• to enable the switch to be managed remotely

• to enable the switch to receive frames from attached PCs

Answer explanation

A switch, as a Layer 2 device, does not need an IP address to transmit frames to attached devices. However, when a switch is accessed remotely through the network, it must have a Layer 3 address. The IP address must be applied to a virtual interface rather than to a physical interface. Routers, not switches, function as default gateways.

A user sends an HTTP request to a web server on a remote network. During encapsulation for this request, what information is added to the address field of a frame to indicate the destination?

• the network domain of the destination host

• the IP address of the default gateway

• the MAC address of the destination host

• the MAC address of the default gateway

Answer explanation

A frame is encapsulated with source and destination MAC addresses. The source device will not know the MAC address of the remote host. An ARP request will be sent by the source and will be responded to by the router. The router will respond with the MAC address of its interface, the one which is connected to the same network as the source.

What is an advantage to using a protocol that is defined by an open standard?

• A company can monopolize the market.

• The protocol can only be run on equipment from a specific vendor.

• An open standard protocol is not controlled or regulated by standards organizations.

• It encourages competition and promotes choices.

Answer explanation

A monopoly by one company is not a good idea from a user point of view. If a protocol can only be run on one brand, it makes it difficult to have mixed equipment in a network. A proprietary protocol is not free to use. An open standard protocol will in general be implemented by a wide range of vendors.

A company uses the address block of 128.107.0.0/16 for its network. What subnet mask would provide the maximum number of equal size subnets while providing enough host addresses for each subnet in the exhibit?

• 255.255.255.192

• 255.255.255.0

• 255.255.255.128

• 255.255.255.240

• 255.255.255.224

Answer explanation

The largest subnet in the topology has 100 hosts in it so the subnet mask must have at least 7 host bits in it (27-2=126). 255.255.255.0 has 8 hosts bits, but this does not meet the requirement of providing the maximum number of subnets.

What two pieces of information are displayed in the output of the show ip interface brief command? (Choose two.)

• IP addresses

• interface descriptions

• MAC addresses

• next-hop addresses

• Layer 1 statuses

Answer explanation

The command show ip interface brief shows the IP address of each interface, as well as the operational status of the interfaces at both Layer 1 and Layer 2. In order to see interface descriptions and speed and duplex settings, use the command show running-config interface. Next-hop addresses are displayed in the routing table with the command show ip route, and the MAC address of an interface can be seen with the command show interfaces.

A user is complaining that an external web page is taking longer than normal to load.The web page does eventually load on the user machine. Which tool should the technician use with administrator privileges in order to locate where the issue is in the network?

• ping

• nslookup

• tracert

• ipconfig

Answer explanation

The Command Prompt command tracert will map the path from the PC to the web server and measure transit delays of packets across the network.

Which value, that is contained in an IPv4 header field, is decremented by each router that receives a packet?

• Header Length

• Differentiated Services

• Time-to-Live

• Fragment Offset

Answer explanation

When a router receives a packet, the router will decrement the Time-to-Live (TTL) field by one. When the field reaches zero, the receiving router will discard the packet and will send an ICMP Time Exceeded message to the sender.