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 CCNA Questions

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Q:

What device must be on your wired network when running an enterprise EAP solution?

Answer

RADIUS Server

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Q:

What does a switch do when a frame is received on an interface and the destination hardware address is unknown or not in the filter table?

A) Forwards the switch to the first available link B) Drops the frame
C) Floods the network with the frame looking for the device D) Sends back a message to the originating station asking for a name resolution
 
Answer & Explanation Answer: C) Floods the network with the frame looking for the device

Explanation:

Switches flood all frames that have an unknown destination address. If a device answers the frame, the switch will update the MAC address table to reflect the location of the device. 

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Q:

Which configuration command must be in effect to allow the use of 8 subnets if the Class C subnet mask is 255.255.25.224?

A) Router(config)#ip classless B) Router(config)#ip version 6
C) Router(config)#ip unnumbered D) Router(config)#ip subnet-zero
 
Answer & Explanation Answer: D) Router(config)#ip subnet-zero

Explanation:

A Class C subnet mask of 255.255.255.224 is 3 bits on and 5 bits off (11100000) and provides 8 subnets, each with 30 hosts. However, if the command ip subnet-zero is not used, then only 6 subnets would be available for use.

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Q:

Which command will configure a switch port to use the IEEE standard method of inserting VLAN membership information into Ethernet frames?

A) Switch (config) #switchport trunk encapsulation ietf B) Switch (config) #switchport trunk encapsulation dot1q
C) Switch (config-if) #switchport trunk encapsulation ietf D) Switch (config-if) #switchport trunk encapsulation dot1q
 
Answer & Explanation Answer: D) Switch (config-if) #switchport trunk encapsulation dot1q

Explanation:

If you are on a 2950 switch, then the interface command is just swichport mode trunk since the 2050 can only run the  IEEE 802.1q version. However, a 3550 can run both ISL and 802.1q, so you must also use the encapsulation command. The argument to choose 802.1q for a trunking protocol is dot1q.

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Q:

An administrator issues the command

A. The PC host PC1 has connectivity with a local host
B. The PC host PC1 has connectivity with a Layer 3 device
C. The PC host PC1 has a default gateway correctly configured
D. The PC host PC1 has connectivity up to Layer 5 of the OSI model
E. The PC host PC1 has the TCP/IP protocol stack correctly installed

Answer

Answer : E


Explanation:


The “ping 127.0.0.1″ command is used to troubleshoot the local network card and the TCP/IP stack to make sure is working correctly. If an ICMP echo reply is received, that shows there are connectivity to a particular host in the network.


 

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Q:

Two workers have established wireless communication directly between their wireless laptops. What type of wireless topology has been created by these employees?

A) BSS B) SSID
C) IBSS D) ESS
 
Answer & Explanation Answer: C) IBSS

Explanation:

Two wireless hosts directly connected wirelessly is no different then two hosts connecting with a crossover cable. They are both ad-hoc networks, but in wireless, we call this an independent Basic Service Set(IBSS).

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Q:

Two connected routers are configured only with RIP routing. What will be the result when a router receives a routing update that contains a higher-cost path to a network already in its routing table?

A) The updated information will be added to the existing routing table B) The update will be ignored and no further action will occur
C) The updated information will replace the existing routing table entry D) The existing routing table entry will be deleted from the routing table and all routers will exchange routing updates to reach convergence
 
Answer & Explanation Answer: B) The update will be ignored and no further action will occur

Explanation:

When a routing update is received by a router, the router first checks the administrative distance (AD) and always chooses the route with the lowest AD. However, if two routes are received and they both have the same AD and differing metrics , then the router will choose the one route with the lowest metrics or , in RIP's case, hop count.

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Q:

What must be configured on the network in order for users on the Internet to view web pages located on Web Server 2?

A. On router R2, configure a default static route to the 192.168.10.0 network
B. On router r2, configure DNS to resolve the URL assigned to Web Server 2 to the 192.168.10.20 address
C. On router R1, configure NAT to translate an address on the 209.165.100.0/24 network to 192.168.10.20
D. On router R1, configure DHCP to assign a registered IP address on the 209.165.100.0/24 network to Web Server 2

Answer

Answer : C

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