Networking

You set the console password, but when you display the configuration, the password doesn’t show up; it looks like this:

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Question: You set the console password, but when you display the configuration, the password doesn’t show up; it looks like this:

[A].

encrypt password

[B].

service password-encryption

[C].

service-password-encryption

[D].

exec-timeout 1 35

Answer: Option B

Explanation:

The command service password-encryption, from global configuration mode, will encrypt the passwords.

You want to totally reinitialize the router and replace the current running-config with the current startup-config. What command will you use?

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Question: You want to totally reinitialize the router and replace the current running-config with the current startup-config. What command will you use?
[A].

replace run start

[B].

copy run start

[C].

copy start run

[D].

reload

Answer: Option D

Explanation:

To completely replace the running-config with the startup-config, you must reload the router. Note : You may have picked option C, which isn’t a bad answer. Remember, though, it doesn’t replace the configuration, it appends it.

You need to find the broadcast address used on a LAN on your router. What command will you type into the router from user mode to find the broadcast address?

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Question: You need to find the broadcast address used on a LAN on your router. What command will you type into the router from user mode to find the broadcast address?
[A].

show running-config

[B].

show startup-config

[C].

show interfaces

[D].

show protocols

Answer: Option C

Explanation:

The command show ip protocols will actually show you the broadcast address for each interface – too bad it isn’t a possible answer. Your best answer is show interfaces, which will provide the IP address and mask for each interface.

You type show running-config and get this output:

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Question: You type show running-config and get this output:

[A].

If no command has been typed in 35 seconds, the console connection will be closed.

[B].

If no router activity has been detected in 1 hour and 35 minutes, the console will be locked out.

[C].

If no commands have been typed in 1 minute and 35 seconds, the console connection will be closed.

[D].

If you’re connected to the router by a Telnet connection, input must be detected within 1 minute and 35 seconds or the connection will be closed.

Answer: Option C

Explanation:

The exec-timeout command is set in minutes and seconds.

You type Router#sh ru and receive an % ambiguous command error. Why did you receive this message?

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Question: You type Router#sh ru and receive an % ambiguous command error. Why did you receive this message?
[A].

The command requires additional options or parameters.

[B].

There is more than one show command that starts with the letters ru.

[C].

There is no show command that starts with ru.

[D].

The command is being executed from the wrong router mode.

Answer: Option B

Explanation:

The % ambiguous command error means that there is more then one possible command that starts with ru. Use a question mark to find the correct command.

You type the following command into the router and receive the following output:

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Question: You type the following command into the router and receive the following output:

[A].

You need to be in privileged mode.

[B].

You cannot have a space between serial and 0/0.

[C].

The router does not have a serial0/0 interface.

[D].

Part of the command is missing.

Answer: Option D

Explanation:

You can view the interface statistics from user mode, but the command is show interface serial 0/0.

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

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

[A].

1, 2 and 4

[B].

3 and 4

[C].

3 and 5

[D].

2, 3 and 5

Answer: Option D

Explanation:

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.

Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?

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Question: Acknowledgments, sequencing, and flow control are characteristics of which OSI layer?
[A].

Layer 2

[B].

Layer 3

[C].

Layer 4

[D].

Layer 7

Answer: Option C

Explanation:

A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. A reliable connection is defined by a virtual circuit that uses acknowledgments, sequencing, and flow control, which are characteristics of the Transport layer (layer 4).

Why does the data communication industry use the layered OSI reference model?

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Question: Why does the data communication industry use the layered OSI reference model?

[A].

1 only

[B].

1 and 4

[C].

2 and 3

[D].

3 only

Answer: Option B

Explanation:

The main advantage of a layered model is that it can allow application developers to
change aspects of a program in just one layer of the layer model’s specifications.

Advantages
of using the OSI layered model include, but are not limited to, the following:

It divides the
network communication process into smaller and simpler components, thus aiding compo-
nent development, design, and troubleshooting;

it allows multiple-vendor development
through standardization of network components;

it encourages industry standardization by
defining what functions occur at each layer of the model;

it allows various types of network
hardware and software to communicate;

and it prevents changes in one layer from affecting
other layers, so it does not hamper development.