cisco networking modules 8-10 communications exam
Which IPv4 address can a host use to ping the loopback interface?
127.0.0.1
Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?
ARP cache
What statement describes the function of the Address Resolution Protocol?
ARP is used to discover the MAC address of any host on the local network.
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.
Which destination address is used in an ARP request frame?
FFFF.FFFF.FFFF
Which statement describes a feature of the IP protocol?
IP relies on upper layer services to handle situations of missing or out-of-order packets.
A network technician issues the arp -d * command on a PC after the router that is connected to the LAN is reconfigured. What is the result after this command is issued?
The ARP cache is cleared.
What information does the loopback test provide?
The TCP/IP stack on the device is working correctly.
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 computer has an invalid default gateway address.
A router boots and enters setup mode. What is the reason for this?
The configuration file is missing from NVRAM.
Within a production network, what is the purpose of configuring a switch with a default gateway address?
The default gateway address is used to forward packets originating from the switch to remote networks.
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 directly to the destination host.
The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?
The switch can be remotely managed from a host on another network.
Which statement describes the treatment of ARP requests on the local link?
They are received and processed by every device on the local network.
How do hosts ensure that their packets are directed to the correct network destination?
They have to keep their own local routing table that contains a route to the loopback interface, a local network route, and a remote default route.
Which field in the IPv4 header is used to prevent a packet from traversing a network endlessly?
Time to Live
What is a basic characteristic of the IP protocol?
connectionless
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?
create a new Layer 2 Ethernet frame to be sent to the destination
Which information is used by routers to forward a data packet toward its destination?
destination IP address
What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward?
destination MAC address
What is one advantage that the IPv6 simplified header offers over IPv4?
efficient packet handling
When transporting data from real-time applications, such as streaming audio and video, which field in the IPv6 header can be used to inform the routers and switches to maintain the same path for the packets in the same conversation?
flow label
Which two types of IPv6 messages are used in place of ARP for address resolution?
neighbor solicitation neighbor advertisement
What IPv4 header field identifies the upper layer protocol carried in the packet?
protocol
What routing table entry has a next hop address associated with a destination network?
remote routes
What are two services provided by the OSI network layer? (Choose two.)
routing packets toward the destination and encapsulating PDUs from the transport layer
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
What is the aim of an ARP spoofing attack?
to associate IP addresses to the wrong MAC address
What are two functions of NVRAM? (Choose two.)
1 to retain contents when power is removed 2 to store the startup configuration file
Under which two circumstances will a switch flood a frame out of every port except the port that the frame was received on? (Choose two.)
1. The frame has the broadcast address as the destination address. 2. The destination address is unknown to the switch.