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Q:

Which of the following is an example of a standard IP access list?

A) access - list 110 permit host 1.1.1.1 B) access - list 1 deny 172 . 16 . 10 . 1 0 . 0 . 0 . 0
C) access - list 1 permit 172 . 16 . 10 . 1 255 . 255 . 0 . 0 D) access - list standard 1 . 1 . 1 . 1
 
Answer & Explanation Answer: B) access - list 1 deny 172 . 16 . 10 . 1 0 . 0 . 0 . 0

Explanation:

Standard IP access lists use the numbers 1 - 99 and 1300 - 1999 and filter based on source IP address only. Option C is incorrect because the mask must be in wildcard format.

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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:

You connect a host to a switch port, but the new host cannot log into the server that is plugged into the same switch. What could the problem be?

A) The router is not configured for the new host B) The VTP configuration on the switch is not updated for the new host
C) The host has an invalid MAC address D) The switch port the host is connected to is not configured with the correct VLAN membership
 
Answer & Explanation Answer: D) The switch port the host is connected to is not configured with the correct VLAN membership

Explanation:

This question is a little Vague, but the best answer is that the VLAN membership for the port is not configured

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Q:

You want to improve network performance by increasing the bandwidth available to hosts and limit the size of the broadcast domains. Which of the following options will achieve this goal?

A) Managed hubs B) Bridges
C) Switches D) Switches configured with VLANs
 
Answer & Explanation Answer: D) Switches configured with VLANs

Explanation:

By creating and implementing VLANs in your switched network, you can break up broadcast domains at layer2. For hosts on different VLANs to communicate, you must have a router or layer 3 switch. 

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Q:

Which switching technology reduces the size of a broadcast domain?

A) ISL B) 802.1Q
C) VLANs D) STP
 
Answer & Explanation Answer: C) VLANs

Explanation:

Virtual LANs break up broadcast domains in layer 2 switched internetworks.

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Q:

Which Cisco 802.1d extension stops BPDU from being transmitted out a port?

Answer

PortFast

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Subject: CCNA

Q:

Which proprietary Cisco STP extensions would put a switch port into err-disabled if a BPDU is received on this port?

Answer

BPDUGuard

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Subject: CCNA

Q:

You have two switches connected together with two crossover cables for redundancy, and STP is disabled. Which of the following will happen between the switches?

A) The routing tables on the switches will not update B) The MAC forward/;filter table will not update on the switch
C) Broadcast storms will occur on the switched network D) The switches will automatically load-balance between the two links
 
Answer & Explanation Answer: C) Broadcast storms will occur on the switched network

Explanation:

If spanning tree is disabled on a switch and you have redundant links to another switch, broadcast stroms will occur, among other possible problems.

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Filed Under: CCNA