CCENT Questions

Q:

A device on a network is ready to send a frame. What is the first thing that CSMA/CD logic does?

A) Sends a token out to instruct other devices not to send packets. B) Sends a jamming signal out to prevent other hosts from sending packets.
C) Sends a discovery message out to find out if the destination host is on the same subnet. D) Listens to see if the Ethernet is busy.
 
Answer & Explanation Answer: D) Listens to see if the Ethernet is busy.

Explanation:
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Q:

which IOS command enables access to high-level commands?

A) su root B) admin 0
C) enable D) init
 
Answer & Explanation Answer: C) enable

Explanation:
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Q:

The exhibit below shows the output of a show ip interface brief on a Cisco router.

r1#show ip interface brief

Serial0/0 does not respond to ping requests. What step would you take to resolve the problem?

A) Change ip address on Serial0/0 B) Enable the interface Serial0/0
C) Check the physical connection in Serial 0/0 D) The interface looks fine in status up, problem must be somewhere else
 
Answer & Explanation Answer: C) Check the physical connection in Serial 0/0

Explanation:

In order for an interface to work properly and respond to ping requests, both Status and Protocol must be up.

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Q:

We want to assign port 3 of our Catalyst 2950 switch to VLAN 3. What command will achieve this?

A) switch(config-if)#switchport vlan 3 B) switch#switchport access vlan 3
C) switch(config)#switchport access vlan 3 D) switch(config-if)#switchport access vlan 3
 
Answer & Explanation Answer: D) switch(config-if)#switchport access vlan 3

Explanation:

Explanation: The switchport access vlan [number] command will configure a switch port to that VLAN. You can also use the switchport access vlan dynamic command to configure the switch port automatically in a certain VLAN depending on the VLAN membership of the incoming packets. For both commands to work properly the switch port needs to be in access mode

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Q:

What does CSMA/CD stand for?

A) Carrier Sense Multiple Action with Collision Detection. B) Carrier Sense Multiple Access with Collisionless Delivery
C) Carrier Sense Multiple Action with Collision Detonation D) Carrier Sense Multiple Access with Collision Detection
 
Answer & Explanation Answer: D) Carrier Sense Multiple Access with Collision Detection

Explanation:
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Q:

You are the network administrator and are given the tasks to plan for the future expansion of the network. You decide to subnet the current network of 172.15.0.0. What will be the subnet mask be if every subnet has to allocate 500 hosts.

A) 255.255.0.0 B) 255.0.0.0
C) 255.255.240.0 D) 255.255.254.0
 
Answer & Explanation Answer: D) 255.255.254.0

Explanation:

Explanation: The requirement of having to allocate 500 hosts on each subnet can be achieved by the following: 2^9 = 512. So deducting the broadcast and network address we have 510 possible hosts on each subnet. We used 9 bits to allocate the hosts, this leaves us 7 bits for possible subnets. Those 7 bits in binary is 1111 1110 or 254 in decimal.

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Q:

As a network administrator we want to make it easy to assign IP addresses to hosts. What protocol do we use?

A) DNS B) DHCP
C) HSRP D) NTP
 
Answer & Explanation Answer: B) DHCP

Explanation:

Explanation: DHCP, as described by RFC 1541, or Dynamic Host Configuration Protocol is used for dynamically assigning network addresses and host specific configuration parameters.

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Q:

What port number is used for FTP control?

A) 20 B) 21
C) 22 D) 25
 
Answer & Explanation Answer: B) 21

Explanation:
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