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CCNA questions - Part 12

Another 5 mixed networking Questions to mull over

1. What is the administrative distance of IGRP?

A) 110
B) 1
C) 120
D) 90
E) 100

2. What TCP/IP layer are Telnet, FTP, TFTP and SMTP protocols associated with?

A) Application
B) Host-to-Host / Transport
C) Internet
D) Network Access

3. What determines network addresses when data link addresses are known?

A) Ping
B) ICMP
C) ARP
D) RARP

4. What mode are you in when you see this prompt?
Router(config-router)#

A) user exec mode
B) privileged mode
C) global configuration mode
D) interface configuration mode
E) routing protocol configuration

5. What does Ethernet 0 is up, line protocol is down indicate?

A) Keepalive or framing issue
B) Carrier detect is not present
C) The interface is shutdown

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1. Correct Answer: E

IGRP has an administrative distance of 100.
Administrative distance is used by Cisco routers to select the best path when there are two
or more different routes to the same destination from two different routing protocols.
administrative distance defines the reliability of a routing protocol.

2. Correct Answer: A

3. Correct Answer: D

Reverse Address Resolution Protocol (RARP) is used by a host computer to request its IPv4
address from an administrative host, it provides the administrative host with its hardware
address (MAC address).
 
4. Correct Answer: E

Here is a summary of Cisco IOS router command prompts:

Router> - User EXEC mode
Router# - Privileged EXEC mode
Router(config)# - Global configuration mode
Router(config-if)# - Interface level configuration mode
Router(config-router)# - Routing engine level within configuration mode
Router(config-line)# - Line level (vty, tty, async) within configuration mode

5. Correct Answer: A

The various states of an interface:


Ethernet0 is up, line protocol is up - The interface is functioning correctly.

Ethernet0 is down, line protocol is down - This message usually represents a physical
interface problem. The cable may be disconnected. This can also occur if this interface is
connected to another router whose interface has been shutdown.

Ethernet0 is up, line protocol is down - The Physical layer connectivity is not the issue.
The line protocol being down is either a clocking issue (keepalives) or a mismatch of the
frame types being used on connected devices. 

 
  “Successful people are always looking for opportunities to help others. Unsuccessful people are always asking, "What's in it for me?"”

    Brian Tracy 

CCNA Questions - Part 11

Another Batch of Questions to have a look at - enjoy.





1. What WLAN standard operates in the 2.4GHz band with a data rate of up to 11Mbps?

A) 802.11a
B) 802.11b
C) 802.11g
D) 802.11h
E) 802.11n

2. What WLAN standard operates in the 5GHz band with a data rate of up to 54Mbps?

A) 802.11a
B) 802.11b
C) 802.11g
D) 802.11h
E) 802.11n

3. What is the administrative distance of RIP?

A) 110
B) 1
C) 120
D) 90
E) 100

4. What is the maximum number of subnets given the following?

192.168.10.0
255.255.255.192

(Assume ip subnet-zero is enabled)


A) 4
B) 8
C) 16
D) 32
E) 64

5. What IOS command would disable CDP on all interfaces of a Cisco router?


A) no cdp enable
B) disable cdp
C) no cdp
D) no cdp run

1. Correct Answer: B

802.11b is the most widely deployed wireless standard and operates in the 2.4GHz band with
a data rate of up to 11Mbps.

2. Correct Answer: A

802.11a operates in the 5GHz band with a data rate of up to 54Mbps and is immune to
interference from other devices operating in the 2.4GHz spectrum.

3. Correct Answer: C

Here in the question the A is administrative distance 110 for OSPF, B is 1 for Static
Route, D is 90 for Internal EIGRP, E is 100 for IGRP so the last C is 120 for RIP. Here You
must be carefull for Internal and External EIGRP's administrative distance and Internal and
xternal BGP. 

4. Correct Answer: A

192.168.10.0 is a class C address.  The subnet mask 255.255.255.192 implies 2 bits are
borrowed. 22 = 4 subnets

5.Correct Answer: D

no cdp run - When disabling a command you use "no" form of the command 

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Spanning Tree protocol

Span Tree - nothing to do with coconuts...

 1. What does the Spanning Tree Protocol achieve?

A) Determines a loop free topology
B) Sets up a meshed switched topology
C) Creates bridge loops and broadcast storms
D) Disseminates VLAN topology

2. What does the following statement do?Switch(config-if)#spanning-tree portfast disable

A) Disables spanning-tree on the switch port
B) Disable spanning tree on the switch
C) Changes the spanning-tree switch to portfast mode

 
1.  Answer: A
 
2. Answer: A

Portfast is a method of disabling STP on a switch port.

Summary

STP (Spanning Tree protocol) is used at layer 2 to prevent routing loops for frames on switches with multiple connections. Without STP, imagine 2 switches connected together with 2 separate Ethernet cables, a frame passes from one switch to the other over cable number 1. Switch 2 by default sends the frame out all ports except the one it came from so then this same frame is routed back via the second cable to the first switch, first switch then looks at the address and routes the frame back out the first cable to switch 2 and around it goes again. 

This is a routing loop, also known as "race tracking", and the frame will eventually cause the interface buffers on the switches to overflow, causing traffic degradation, increased CPU and ultimately switch crash. 

STP prevents this from happening by blocking ports between switches, allowing traffic to pass over one link only.  It has to be remembered that STP works vlan by vlan, so you can balance traffic across multiple links by the use of weighting, to allow some vlans on one trunk and others on the other.  Very useful protocol.

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CCNA Exam Questions Part 10

Another set of Random Nework related questions to mull over - have fun.


1. What effect will the shutdown command have on a Cisco router if you are in the Router(config-if)# mode?

A.) disable the router
B.) disable all inbound traffic
C.) disable the current interface
D.) disable remote access to the router

2. IP and IPv6 and IPX are examples of...

A.) Routing protocols
B.) Routed protocols

3. Cisco Routers are what by default?

A.) DTE devices
B.) DCE devices

4. What would the command copy run start achieve?

A.) Copy the startup configuration to RAM
B.) Copy the running configuration to NVRAM
C.) This is not a correct IOS command

5. If a switch receives a multicast frame, what does it do with it?

A.) Forwards it out every port
B.) Sends it back to the originator asking for a destination address
C.) Drops the frame

6, What is the default setting on a router for the invalid timer if you are using IGRP?

A.) 90 seconds
B.) 30 seconds
C.) 280 seconds
D.) 270 seconds
E.) 180 seconds

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1. Correct Answer C

disable the current interface

2. Correct Answer B

Routed protocols
ROUTED PROTOCOLS are nothing more than data being transported across the networks.
Eg IP, IPV6 and IPX

ROUTING PROTOCOLS are the software that allow routers to dynamically advertise and learn routes, determine which routes are available and which are the most efficient routes to a destination.
Eg BGP, OSPF, RIP

3. Correct Answer A

DTE devices (Data Terminal Equipment) which basically means they receive or slave off the clock source provided by the carrier Circuit (DCE). Cisco Interfaces can be configured to DCE mode (they supply clock) by adding the Clock rate command.

4. Correct Answer B

Copy the running configuration to NVRAM

5. Correct Answer A

Internally multicast is treated the same as a broadcast. So the Switch will send it to all ports except from which it was recieved. Same way it will treat a broadcast.

6.  Correct Answer: D

IGRP sends its routing table to its neighbors every 90 seconds. IGRP uses an invalid timer to mark a route as invalid after 270 seconds (three times the update timer). IGRP uses a flush timer to remove a route from the routing table (default flush timer is 630 seconds, seven times the update period).

 "Man's mind stretched to a new idea never goes back to its
original dimensions."
Gerald Holton