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On a live network, which commands will verify the operational status of router interfaces? (Choose two.)

A.    Router# show interfaces
B.    Router# show ip protocols
C.    Router# debug interface
D.    Router# show ip interface brief
E.    Router# show start

Answer: AD
Both these commands will show the current status of the interfaces, either in show or debug mode both will display the information.

Which router command will configure an interface with the IP address

A.    router(config-if)# ip address
B.    router(config-if)# ip address
C.    router(config-if)# ip address
D.    router(config-if)# ip address
E.    router(config-if)# ip address
F.    router(config-if)# ip address

Answer: D
255.255.224 equal /19 in CIDR format hence the answer

What two things does a router do when it forwards a packet? (Choose two.)

A.    switches the packet to the appropriate outgoing interfaces
B.    computes the destination host address
C.    determines the next hop on the path
D.    updates the destination IP address
E.    forwards ARP requests

Answer: AC
Without following these two processes namely switching the packet to appropriate interface and telling the packet where to go by providing it with a destination IP address, the purpose of the same would not be solved.

Which two of these functions do routers perform on packets? (Choose two.)

A.    examine the Layer 2 headers of inbound packets and use that information to determine the next
hops for the packets
B.    update the Layer 2 headers of outbound packets with the MAC addresses of the next hops
C.    examine the Layer 3 headers of inbound packets and use that information to determine the next
hops for the packets
D.    examine the Layer 3 headers of inbound packets and use that information to determine the complete
paths along which the packets will be routed to their ultimate destinations
E.    update the Layer 3 headers of outbound packets so that the packets are properly directed to valid
next hops
F.    update the Layer 3 headers of outbound packets so that the packets are properly directed to their
ultimate destinations

Answer: BC
This is the basic function of the router to receive incoming packets and then forward them to their required de
stination. This is done by reading layer 3 headers of inbound packets and update the info to layer 2 for further hopping.

The command ip route was issued on a router. No routing protocols or other static routes are configured on the router. Which statement is true about this command?

A.    The interface with IP address is on this router.
B.    The command sets a gateway of last resort for the router.
C.    Packets that are destined for host will be sent to
D.    The command creates a static route for all IP traffic with the source address

Answer: C
160 it’s actually network address of /27 so any address within the range of 160 network will be sent to

What does administrative distance refer to?

A.    the cost of a link between two neighboring routers
B.    the advertised cost to reach a network
C.    the cost to reach a network that is administratively set
D.    a measure of the trustworthiness of a routing information source

Answer: D
Administrative distance is the first criterion that a router uses to determine which routing protocol to use if two protocols provide route information for the same destination. Administrative distance is a measure of the trustworthiness of the source of the routing information. The smaller the administrative distance value, the more reliable the protocol.

Which IOS command is used to initiate a login into a VTY port on a remote router?

A.    router# login
B.    router# telnet
C.    router# trace
D.    router# ping
E.    router(config)# line vty 0 5
F.    router(config-line)# login

Answer: B
VTY ports are telnet ports hence command B will initiate login to the telnet port.

In the configuration of NAT, what does the keyword overload signify?

A.    When bandwidth is insufficient, some hosts will not be allowed to access network translation.
B.    The pool of IP addresses has been exhausted.
C.    Multiple internal hosts will use one IP address to access external network resources.
D.    If the number of available IP addresses is exceeded, excess traffic will use the specified address pool.

Answer: C
Overload simply means using multiple hosts to access the network using the same translated IP address.

What happens when computers on a private network attempt to connect to the Internet through a Cisco router running PAT?

A.    The router uses the same IP address but a different TCP source port number for each connection.
B.    An IP address is assigned based on the priority of the computer requesting the connection.
C.    The router selects an address from a pool of one-to-one address mappings held in the lookup table.
D.    The router assigns a unique IP address from a pool of legally registered addresses for the duration of
the connection.

Answer: A
Port Address Translation makes the PC connect to the Internet but using different TCP source port

When configuring NAT, the Internet interface is considered to be what?

A.    local
B.    inside
C.    global
D.    outside

Answer: D
Network address translation or NAT requires the Internet to be considered as an outside interface else it won’t serve the purpose it intends to.

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