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 CISCO Certification Questions

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Q:

What type of RJ45 UTP cable do you use to connect a PC's COM port to a router or switch console port?

A) Straight - through B) Crossover cable
C) Crossover with a CSU/DSU D) Rolled
 
Answer & Explanation Answer: D) Rolled

Explanation:

To connect to a router or switch console port, you would use an RJ45 UTP rolled cable.

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Q:

If one of the host connected to Sw-AC3 wants to send message to ip 190.0.2.5 (or any ip on a different subnet) what will be the destination MAC address ?

Answer

Answer and Explanation:


Because the destination address is on a different subnet from the switch, the packet will be forwarded to its default gateway. To verify the default gateway of this switch, use the show running-config command



From the output above, we can see that its default-gateway is 192.168.1.254. Which can be said to be a layer 3 device (router); in this case, the VLAN-R1 router. You can use the show cdp neighbor detail command verify further.



From the output above, you can confirm that the switch's default gateway is VLAN-R1 router (with the IP address of 192.168.1.254).The interface FastEthernet0/3 shows that the switch is directly connected to VLAN-R1 router through the switchport Fa0/3. To verify the MAC address associated this interface is interface, you use the show mac-address-table command:



Looking closely at the table above, you will discorver that the corresponding MAC address is 000a.b7e9.8360. Although there are some entries on port Fa0/3 with different Vlans ,but they have the same MAC address.


From the output above, you can confirm that the switch's default gateway is VLAN-R1 router (with the IP address of 192.168.1.254).The interface FastEthernet0/3 shows that the switch is directly connected to VLAN-R1 router through the switchport Fa0/3. To verify the MAC address associated this interface is interface, you use the show mac-address-table command
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Q:

All hosts in the networks have been operational for several hours when the DHCP server goes down. What happens to the hosts that have obtained service from the DHCP server?

A. The hosts will not be able to communicate with any other hosts.
B. The hosts will continue to communicate normally for a period of time.
C. The hosts will be able to communicate with hosts outsides their own network
D. The hosts will only be able to communicate with other hosts by IP address not by host name

Answer

Answer : B


 


Explanation : Dynamic Host configuration Protocol – DHCP – assigns an IP address to a client for a limited period of time, this address is then saved in a database. When the DHCP Server goes down, that client can still use the allocated IP address for a limited period of time.

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Subject: CCNA

0 5477
Q:

In practical IPv6 application, The encapsulation of IPv6 packets inside IPv4 packets is called what?

A. tunneling
B. hashing
C. routing
D. NAT

Answer

Answer : A


Explanation:


Remember,  most network is still build on IPv4 structure and IPv4 is not going away in a hurry… one of the many techniques used to migrate to IPv6 is Tunneling.


Tunneling is a method that a network built on IPv4 structure can be configured to traffic IPv6 packet simultaneously.

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Q:

When data is encapsulated , which is the correct order?

A) Data, frame, packet, segment, bit B) Segment, data, packet, frame, bit
C) Data, segment, packet, frame, bit D) Data, segment, frame, packet, bit
 
Answer & Explanation Answer: C) Data, segment, packet, frame, bit

Explanation:

The encapsulation method is data, segment, packet, frame, bit.

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Q:

What is meant by same layer interaction

A) That a packet is forwarded to a different host that resides in the same layer of the Cisco three layer hierarchical model. B) That an interaction occurs within a single layer of a networking model and that no other layers or devices take any part in the interaction.
C) An interaction that progresses up or down only one level of a networking model. D) That two computers use a protocol defined at the same layer of a networking model to communicate with each other.
 
Answer & Explanation Answer: D) That two computers use a protocol defined at the same layer of a networking model to communicate with each other.

Explanation:
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0 5261
Q:

When a router is connected to a Frame Relay WAN link using a serial DTE interface, how is the clock rate determined?

A) Supplied by the CSU/DSU B) By the far end router
C) By the clock rate command D) By the Physical layer bits stream timing
 
Answer & Explanation Answer: A) Supplied by the CSU/DSU

Explanation:

Clocking on a serial interface is always provided by the CSU/DSU (DCE device). However, if you do not have a CSU/DSU in your non-production test environment, then you need to supply clocking with the clock rate command on the serial interface of the router with the DCE cable attached.

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0 5200
Q:

What multicast addresses does EIGRPv6 use?

A) FF02::A B) FF02::9
C) FF02::5 D) FF02::6
 
Answer & Explanation Answer: A) FF02::A

Explanation:

EIGRPv6's multicast address stayed very near the same. In IPv4 it was 224.0.0.10; now it is FF02::A (A = 10 in decimal notation)

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