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 CCNA Questions

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Q:

To test the IP stack on your local host, which IP address would you ping?

A) 127.0.0.0 B) 1.0.0.127
C) 127.0.0.1 D) 127.0.0.255
 
Answer & Explanation Answer: C) 127.0.0.1

Explanation:

To test the localstack on your host, ping the loop back interface of 127.0.0.1

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Q:

What router command allows you to determine whether an IP access list is enabled on a particular interface?

A) show ip port B) show access - lists
C) show ip interface D) show access - lists interface
 
Answer & Explanation Answer: C) show ip interface

Explanation:

Of the available choices only the show ip interface command will tell you which interfaces have access lists applied. show access - lists will not show you which interfaces have an access list applied. 

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Q:

With which network type will OSPF establish router adjacencies but not perform the DR/BDR election process?

A) Point-to-Point B) Backbone area 0
C) Broadcast multi-access D) Non-broadcast multi-access
 
Answer & Explanation Answer: A) Point-to-Point

Explanation:

No DR is assigned on any type of point-to-point link. No DR/BDR is assigned on the NBMA point-to-multipoint due to the hub/spoke  topology. DR and BDR are elected on broadcast and non-broadcast multi-access network. Frame relay is a non-broadcast multiaccess (NBMA) network by default.

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Q:

Which command will show you whether a DTE or a DCE cable is plugged into serial 0?

A) sh int s0 B) sh int serial 0
C) show controllers s 0 D) show serial 0 controllers
 
Answer & Explanation Answer: C) show controllers s 0

Explanation:

The Show controllers serial 0 command will show you whether either a DTE or DCE cable is connected to the interface. If it is a DCE connection, you need to add clocking with the clock rate command

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Q:

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

A) Packets addressed to a multicast address are delivered to a single interface B) packets are delivered to all interfaces identified with the address. This is also called a one-to-many address
C) A multicast address identifies multiple interfaces and is delivered to only one address. This address can also be called one-to-one-of-many D) These addresses are meant for nonrouting purposes,but they are almost globally unique, so it is unlikely they will have an address overlap
 
Answer & Explanation Answer: B) packets are delivered to all interfaces identified with the address. This is also called a one-to-many address

Explanation:

Packets addressed to a multicast address are delivered to all interfaces identified with 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.

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Q:

At which layer of the OSI model would you assume the problem is if you type show interface serial 1 and receive the following message?

Serial 1 is down, line protocol is down

A) Physical layer B) Data Link layer
C) Network layer D) None
 
Answer & Explanation Answer: A) Physical layer

Explanation:

If you see that a serial interface and the protocol are both down, then you have a physical layer problem. If you see serial 1 is up, line protocol is down, then you are not receiving (Data Link) Keepalives from the remote end.

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Q:

You need to create an access list that will prevent hosts in the network range of 192.168.160.0 to 192.168.191.0 . Which of the following lists will you use?

A) access - list 10 deny 192.168.160.0 255.255.224.0 B) access - list 10 deny 192.168.160.0 0.0.191.255
C) access - list 10 deny 192.168.160.0 0.0.31.255 D) access - list 10 deny 192.168.0.0 0.0.31.255
 
Answer & Explanation Answer: C) access - list 10 deny 192.168.160.0 0.0.31.255

Explanation:

The range of 192.168.160.0 to 192.168.191.0 is a block size of 32. The network address is 192.168.160.0 and the mask would be 255.255.224.0, which for an access list must be a wildcard format of 0.0.31.255 . The 31 is used for a block size of 32. The wildcard is always one less than the block size.

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Q:

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

A) truck on B) truck all
C) switchport trunk on D) switchport mode trunk
 
Answer & Explanation Answer: D) switchport mode trunk

Explanation:

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

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