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Networking Questions And Answers Sample Test 10

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Networking Test 10

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1.      What is route poisoning?


Another way to avoid problems caused by inconsistent updates and to stop network loops is route poisoning. When a network goes down, the distance-vector routing protocol initiates route poisoning by advertising the network with a metric of 16, or unreachable (sometimes referred to as infinite).

2. How many non-overlapping channels are available with 802.11a?


The IEEE 802.11a standard provides up to 12 non-overlapping channels.

3. What VTP mode allows you to change VLAN information on the switch?


Only in server mode can you change VTP information on a switch.

What two multicast addresses does OSPFv3 use?



Adjacencies and next-hop attributes now use link-local addresses, and OSPFv3 still uses multicast traffic to send its updates and acknowledgments with the addresses FF02::5 for OSPF routers and FF02::6 for OSPF designated routers. These are the replacements for and, respectively.

  What command will display the forward/filter table


The command show mac address-table displays the forward/filter table on the switch.

6. What is the subnetwork number of a host with an IP address of


A /21 is, which means we have a block size of 8 in the third octet, so we just count by 8 until we reach 66. The subnet in this question is 64.0. The next subnet is 72.0, so the broadcast address of the 64 subnet is 71.255

Which two of the following are true regarding the distance-vector and link-state routing protocols?

Link state sends its complete routing table out all active interfaces on periodic time intervals.
Distance vector sends its complete routing table out all active interfaces on periodic time intervals.
Link state sends updates containing the state of its own links to all routers in the internetwork.
Distance vector sends updates containing the state of its own links to all routers in the internetwork.


The distance-vector routing protocol sends its complete routing table out all active interfaces at periodic time intervals. Link-state routing protocols send updates containing the state of its own links to all routers in the internetwork.

Which statement(s) about IPv6 addresses are true?

Leading zeros are required.
Two colons (::) are used to represent successive hexadecimal fields of zeros.
Two colons (::) are used to separate fields.
A single interface will have multiple IPv6 addresses of different types.


In order to shorten the written length of an IPv6 address, successive fields of zeros may be replaced by double colons. In trying to shorten the address further, leading zeros may also be removed. Just as with IPv4, a single device's interface can have more than one address; with IPv6 there are more types of addresses and the same rule applies. There can be link-local, global unicast, and multicast addresses all assigned to the same interface.

Your switch has a port status LED that is alternating between green and amber. What could this indicate?


When you connect to a switch port, at first the link lights are orange/amber, and then they turn green, indicating normal operation. If the link light is blinking, you have a problem.

10. When setting up Frame Relay for point-to-point subinterfaces, which of the following must not be configured?


It is very important to remember when studying the CCNA exam objectives, and when configuring Frame Relay with point-to-point subinterfaces, that you do not put an IP address on the physical interface.

11. Which of the following is true when describing a multicast address?


Packets addressed to a multicast address are delivered to all interfaces identified by the multicast address, the same as in IPv4. It is also called a one-to-many address. You can always tell a multicast address in IPv6 because multicast addresses always start with FF

In which circumstance are multiple copies of the same unicast frame likely to be transmitted in a switched LAN?


If the Spanning Tree Protocol is not running on your switches and you connect them together with redundant links, you will have broadcast storms and multiple frame copies.

13. What is the address range of a Class B network address in binary?


The range of a Class B network address is 128-191. This makes our binary range 10xxxxxx.

Which of the following types of connections can use full duplex?

Hub to hub
Switch to switch
Host to host
Switch to hub
Switch to hostwing types of connections can use full duplex?


Hubs cannot run full-duplex Ethernet. Full duplex must be used on a point-to-point connection between two devices capable of running full duplex. Switches and hosts can run full duplex between each other, but a hub can never run full duplex.

15. Which command will show you the summary of the NAT configuration?


The show ip nat statistics command displays a summary of the NAT configuration as well as counts of active translation types, hits to an existing mapping, misses (causing an attempt to create a mapping), and expired translations.

Which statement is true regarding classless routing protocols?

The use of discontiguous networks is not allowed.
The use of variable length subnet masks is permitted.
RIPv1 is a classless routing protocol.
IGRP supports classless routing within the same autonomous system.
RIPv2 supports classless routing.


Classful routing means that all hosts in the internetwork use the same mask. Classless routing means that you can use Variable Length Subnet Masks (VLSMs) and can also support discontiguous networking.

17. Which of the following is private IP address?


Class A private address range is through Class B private address range is through, and Class C private address range is through

18. Which of the following are benefits of VLANs?
They increase the size of collision domains.
They allow logical grouping of users by function.
They can enhance network security.
They increase the size of broadcast domains while decreasing the number of collision domains.
They simplify switch administration.
They increase the number of broadcast domains while decreasing the size of the broadcast domains.


VLANs break up broadcast domains in a switched layer 2 network, which means smaller broadcast domains. They allow configuration by logical function instead of physical location and can create some security if configured correctly.

19. Which of the following is considered to be the address before translation?


The host on the private network before translation is considered to be an inside local host.

20. Which of the following is true when describing a link-local address?


Link-local addresses are meant for throwing together a temporary LAN for meetings or a small LAN that is not going to be routed but needs to share and access files and services locally.

21. Which command is used to determine if an IP access list is enabled on a particular interface?


The show ip interface command will show you if any outbound or inbound interfaces have an access list set.

22. What multicast addresses does EIGRPv6 use?


EIGRPv6's multicast address stayed very near the same. In IPv4 it was; now it is FF02::A (A=10 in hexadecimal notation).

The Acme Corporation is implementing dial-up services to enable remote-office employees to connect to the local network. The company uses multiple routed protocols, needs authentication of users connecting to the network, and since some calls will be long distance, needs callback support. Which of the following protocols is the best choice for these remote services?


PPP is your only option, as HDLC and Frame Relay do not support these types of business requirements. PPP provides dynamic addressing, authentication using PAP or CHAP, and callback services.

24. What is the maximum distance with maximum data rate for 802.11g?


The IEEE 802.11g standard provides a maximum data rate of up to 54Mbps, but you need to be close to the access point, somewhere around 90 to 100 feet.

25. What keystroke will terminate setup mode?


You can exit setup mode at any time by using the keystroke Ctrl+C.

26. Which of the following commands sets a trunk port on a 2960 switch?


To set a switch port to trunk mode, which allows all VLAN information to pass down the link, use the switchport mode trunk command.

27.     How often are BPDUs sent from a layer 2 device


Every 2 seconds, BPDUs are sent out from all active bridge ports by default.

The Corporate router receives an IP packet with a source IP address of and a destination address of Looking at the output from the Corporate router, what will the router do with this packet?

Corp#sh ip route
[output cut]
R [120/2] via, 00:00:23, Serial0/0
R [120/1] via, 00:00:23, Serial0/0
R [120/1] via, 00:00:23, Serial0/0
C is directly connected, Serial0/0
C is directly connected, FastEthernet0/0


Since the routing table shows no route to the network, the router will discard the packet and send an ICMP destination unreachable message out interface FastEthernet 0/0, which is the source LAN where the packet originated from.

29. What are the decimal and hexadecimal equivalents for the binary number 10110111?


You must be able to take a binary number and convert it into both decimal and hexadecimal. To convert to decimal, just add up the 1s using their values. The values that are turned on with the binary number of 10110111 are 128 + 32 + 16 + 4 + 2 + 1 = 183. To get the hexadecimal equivalent, you need to break the eight binary digits into nibbles (4 bits), 1011 and 0111. By add- ing up these values, you get 11 and 7. In hexadecimal, 11 is B, so the answer is 0xB7.

30. Which of the following is an example of a standard IP access list?


Standard IP access lists use the numbers 1-99 and 1300-1999 and filter based on source IP address only. Option C is incorrect because the mask must be in wildcard format.

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