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Ccna2 Flashcards

1
Q

Which information is used by routers to forward a data packet toward its destination?

A

destination IP address

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2
Q

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?

A

create a new Layer 2 Ethernet frame to be sent to the destination

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3
Q

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

A

The packet will be sent directly to the destination host.

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4
Q

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

A

127.0.0.1

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5
Q

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

A

The computer has an invalid default gateway address.

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6
Q

Which statement describes a feature of the IP protocol?

A

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

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7
Q

Why is NAT not needed in IPv6?​

A

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

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8
Q

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

A

the lower metric value that is associated with the destination network

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9
Q

What are two services provided by the OSI network layer? (Choose two.)

A

routing packets toward the destination
encapsulating PDUs from the transport layer

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10
Q

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

A

The default gateway address is used to forward packets originating from the switch to remote networks.

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11
Q

What is a basic characteristic of the IP protocol?

A

Connectionless

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12
Q

Which field in the IPv4 header is used to prevent a packet from traversing a network endlessly?

A

Time-to-Live

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13
Q

What is one advantage that the IPv6 simplified header offers over IPv4?

A

efficient packet handling

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14
Q

What IPv4 header field identifies the upper layer protocol carried in the packet?

A

Protocol

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15
Q

What information does the loopback test provide?

A

The TCP/IP stack on the device is working correctly.

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16
Q

What routing table entry has a next hop address associated with a destination network?

A

remote routes

17
Q

How do hosts ensure that their packets are directed to the correct network destination?

A

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.​

18
Q

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?

A

Flow Label

19
Q

What statement describes the function of the Address Resolution Protocol?

A

ARP is used to discover the MAC address of any host on the local network.

20
Q

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.)

A

The frame has the broadcast address as the destination address.
The destination address is unknown to the switch.

21
Q

Which statement describes the treatment of ARP requests on the local link?

A

They are received and processed by every device on the local network.

22
Q

Which destination address is used in an ARP request frame?

A

FFFF.FFFF.FFFF

23
Q

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?

A

The ARP cache is cleared.

24
Q

Refer to the exhibit. The exhibit shows a small switched network and the contents of the MAC address table of the switch. PC1 has sent a frame addressed to PC3. What will the switch do with the frame?

A

The switch will forward the frame to all ports except port 4.

25
Q

Which two types of IPv6 messages are used in place of ARP for address resolution?

A

neighbor solicitation
neighbor advertisement

26
Q

What is the aim of an ARP spoofing attack?

A

to associate IP addresses to the wrong MAC address

27
Q

Refer to the exhibit. PC1 attempts to connect to File_server1 and sends an ARP request to obtain a destination MAC address. Which MAC address will PC1 receive in the ARP reply?

A

the MAC address of the G0/0 interface on R1

28
Q

Where are IPv4 address to Layer 2 Ethernet address mappings maintained on a host computer?

A

ARP cache

29
Q

What important information is examined in the Ethernet frame header by a Layer 2 device in order to forward the data onward

A

destination MAC address

30
Q

A new network administrator has been asked to enter a banner message on a Cisco device. What is the fastest way a network administrator could test whether the banner is properly configured?

A

Exit privileged EXEC mode and press Enter.

31
Q

What are two functions of NVRAM? (Choose two.)

A

to retain contents when power is removed
to store the startup configuration file

32
Q

A router boots and enters setup mode. What is the reason for this?

A

The configuration file is missing from NVRAM.

33
Q

The global configuration command ip default-gateway 172.16.100.1 is applied to a switch. What is the effect of this command?

A

The switch can be remotely managed from a host on another network.

34
Q

What happens when the transport input ssh command is entered on the switch vty lines?

A

Communication between the switch and remote users is encrypted.

35
Q

Refer to the exhibit. A user PC has successfully transmitted packets to www.cisco.com. Which IP address does the user PC target in order to forward its data off the local network?

A

172.20.0.254

36
Q

Which three commands are used to set up secure access to a router through a connection to the console interface? (Choose three.)

A

line console 0
login
password cisco

37
Q

Which two functions are primary functions of a router? (Choose two.)

A

Packet -forwarding
path-selection

38
Q

What is the effect of using the Router# copy running-config startup-config command on a router?

A

The contents of NVRAM will change.

39
Q

What are two potential network problems that can result from ARP operation? (Choose two.)

A

On large networks with low bandwidth, multiple ARP broadcasts could cause data communication delays.
Network attackers could manipulate MAC address and IP address mappings in ARP messages with the intent of intercepting network traffic

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