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Q:

If you wanted to deny all Telnet connections to only network 192.168.10.0, which command could you use?

A) access-list 100 deny tcp 192.168.10.0 255.255.255.0 eq telnet	B) access-list 100 deny tcp 192.168.10.0 0.255.255.255 eq telnet
C) access - list 100 deny tcp any 192.168.10.0 0.0.0.255 eq 23	D) access - list 100 deny 192.168.10.0 0.0.0.255 any eq 23

Answer & Explanation Answer: C) access - list 100 deny tcp any 192.168.10.0 0.0.0.255 eq 23

Explanation:

The extended access list ranges are 100 - 199 and 2000 - 2699, so the access-list number of 100 is valid. Telnet uses TCP, so the protocol TCP is valid. Now you just need to look for the source and destination address. only the third option has the correct sequence of parameters. Option B may work, but the question specifically states "only" to network 192.168.10.0, and the wildcard in option B is too broad.

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Q:

A switch has been configured configured for three different VLANs : VLAN2, VLAN3 and VLAN4. A router has been added to provide communication between the VLANs. What minimum type of interface necessary on the router if only one connection is to be made between the router and the switch?

A) 10Mbps Ethernet	B) 56Kbps Serial
C) 100Mbps Ethernet	D) 1Gbps Ethernet

Answer & Explanation Answer: C) 100Mbps Ethernet

Explanation:

Although you can use either 100Mbps or 1Gbps Ethernet, the 100Mbps is necessary at a minimum and is the best answer to this question. You need to trunk the link from the switch to the router to make this connection work with inter-VLAN communication.

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Q:

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

Answer

BPDUGuard

Workspace

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Subject: CCNA

Q:

If you want to disable STP on a port connected to a server, which command would you use?

A) disable spanning-tree	B) spanning-tree off
C) spanning-tree security	D) spanning-tree portfast

Answer & Explanation Answer: D) spanning-tree portfast

Explanation:

If you have a server or other devices connected into your switch that you're totally sure won't create a switching loop if STP is disabled, you can use something called portfast on these ports. Using it means the port won't spend the usual 50 seconds to come up while STP is converging.

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Q:

If a switch receives a frame and the source MAC address is not in the MAC address table but the destination address is, what will the switch do with the frame?

A) Discard it and send an error message back to the originating host	B) Flood the network with the frame
C) Add the source addres and port to the MAC address table and forward the frame out the destination port	D) Add the destination to the MAC address table and then forward the frame

Answer & Explanation Answer: C) Add the source addres and port to the MAC address table and forward the frame out the destination port

Explanation:

Since the source MAC address is not in the MAC address table, the switch will add the source address and the port it is connected to into the MAC address table and then forward the frame to the outgoing port.

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Q:

If routers in a single area are configured with the same priority value, what value does a router use for the OSPF Router ID in the absence of a loopback interface?

A) The Lowest IP address of any physical interface	B) The Highest IP address of any physical interface
C) The Lowest IP address of any logical interface	D) The Highest IP address of any logical interface

Answer & Explanation Answer: B) The Highest IP address of any physical interface

Explanation:

At the moment of OSPF process startup, the highest IP address on any active interface will be the Router ID (RID) of the router . If you have a loopback interface configured (logical interface), then that will override the interface IP address and become the RID of the router automatically.

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Q:

If your routing table has a static, a RIP, and an EIGRP route to the same network, which route will be used to route packets by default?

A) Any available route	B) RIP route
C) Static route	D) EIGRP route

Answer & Explanation Answer: C) Static route

Explanation:

Static routes have an administrative distance of 1 by default. Unless you change this, a static route will always be used over any other dynamically learned route. EIGRP has an administrative distance of 90, and RIP has an administrative distance of 120, by default

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Q:

If you want to have more than one Telnet session open at the same time, what keystroke combination would you use?

A) Tab+spacebar	B) Ctrl+X, then 6
C) Ctrl+Shift+X, then 6	D) Ctrl+Shift+6, then X

Answer & Explanation Answer: D) Ctrl+Shift+6, then X

Explanation:

To keep open one or more Telnet sessions, use the Ctrl+Shift+6 and then X keystroke combination.

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