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 CCNA interview questions  CCNA Interview Questions
 CCDA interview questions  CCDA Interview Questions
Question
What is Spanning Tree Protocol and how it work? I know it 
is - STP is Spanning tree Protocol. It Stops the looping in 
the network? How STP work? How it stop Looping in network?
 Question Submitted By :: Kapilasdhir
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What is Spanning Tree Protocol and how it work? I know it is - STP is Spanning tree Protocol. It Stops the looping in the network? How STP work? How it stop Looping in network?
Answer
# 1
STP is a Protocol used for the loop free environment, when a
network is totally based on a switch....as we know that to
ensure the all time availability of the network we have to
develop redundancy....if the destination is unknown and has
to find out by the switch.... now because of this redundancy
loop occurs..

to solve this problem STP is used..in STP there is a main
head of all switches called ROOT BRIDGE (the Switch having
lowest MAC address or Lowest Priority value - default is 32678).

Main step is to find out all the possible paths to each
destination. After that root bridge uses STA (spanning Tree
algorithm)to find out the best suitable path to the destination.
 Other paths to the same destination are set to blocking
mode to avoid the looping....
 In this the other non-Root bridge switches continues to
update them selves by receiving the BPDU every 2 secs
generated by the root bridge....

In STP there are five main modes that a switch can have:
1. Blocking   :in this case the switch doesn't forwards the
data, but receives BPDUS
2. Listening  :in this switch starts checking the updates
3. Learning   :in this the switch starts updating itself,
according to the updates
4. Forwarding :switch starts forwarding the main data(here
the network is called as Converged-meand each and every
switch has its cam table equal)
5. Disabled   :port is disabled by admin
 
Is This Answer Correct ?    10 Yes 2 No
Guest
 
  Re: What is Spanning Tree Protocol and how it work? I know it is - STP is Spanning tree Protocol. It Stops the looping in the network? How STP work? How it stop Looping in network?
Answer
# 2
STP is a Protocol used for the loop free environment, when a
network is totally based on a switch....as we know that to
ensure the all time availability of the network we have to
develop redundancy....if the destination is unknown and has
to find out by the switch.... now because of this redundancy
loop occurs..
 
Is This Answer Correct ?    0 Yes 0 No
Rahul Sharma
 
 
 

 
 
 
Other CCNA Interview Questions
 
  Question Asked @ Answers
 
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Identify the default IPX serial encapsulation? A.) Novell-Ether B.) SDLC C.) SNAP D.) HDLC  1
Identify the type of hardware required to connect a Token ring network to an Ethernet network? A.) Repeater B.) TR-Enet C.) Router D.) Token Ring to Ethernet translation hub  1
Identify the following components of the IPX address 2e.0000.0065.ed43 A.) Not a valid IPX address B.) Network = 2e, Subnet = 0000, Node = 0065.ed43 C.) Network = 2e.0000, Node = 0065.ed43 D.) Network = 2e, Node = 0000.0065.ed43  1
Which of the following is a characteristic of a switch, but not of a router? A.) Switches forward packets based on the IPX or IP address in the frame B.) Switches forward packets based on the IP address in the frame C.) Switches forward packets based on the MAC address in the frame D.) Switches forward packets based only on the IP address in the packet  1
The Internet Control Message Protocol occurs at what layer of the seven layer model? A.) Physical B.) Transport C.) Session D.) Datalink E.) Presentation F.) Network  2
Identify 2 characteristics of PPP? A.) Uses LLC to establish the link B.) Default serial encapsulation C.) Support multiple layer 3 protocols D.) Offers two types of authentication; PAP and CHAP  1
As a system administrator, you want to debug igrp but are worried that the "debug IP igrp transaction" command will flood the console. What is the command that you should use? A. debug IP igrp event B. debug IP igrp-events C. debug IP igrp summary D. debug IP igrp events  1
Which 3 statements describe default encapsulation and LMI type configuration? A.) There are only 4 encapsulations and 3 LMI type options B.) The LMI type config term options C.) In release 11.2 the LMI type is autosensed D.) The default LMI is Cisco E.) IETF encapsulation must be configured unless the connecting routers are both Cisco  1
Identify the following command to configure a secret password to 'cisco'? A.) Router(config)#enable password cisco secret B.) Router(config)#enable secret cisco C.) Router(config)#enable secret password cisco D.) Router(config)#set secret = cisco  1
Which of the following provide connection-oriented transport to upper layer protocols? A.) SPX B.) RIP C.) NLSP D.) NCP  1
What are two purposes for segmenting a network with a bridge? (Choose two) A. to reduce collisions B. to increase collisions C. to add collision domains D. to reduce collision domains E. to have more broadcast domains  1
Identify the command to configure ALL the default VTY ports? A.) Router(config)# line vty 0 4 B.) Router# line vty 0 4 C.) Router(config)# line vty D.) Router(config)# line vty 0 Accel2
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Which of the following would be displayed by the command 'SHOW CDP NEIGHBOR DETAIL'? A.) The incoming/outgoing port. B.) The hardware platform. C.) One address per protocol. D.) Amount of Flash Memory Available E.) The routers hostname. F.) The subnet mask, if IP is configured.  1
What is the difference between TCP and UDP? A.) TCP is connection-oriented; UDP uses acknowledgements only B.) TCP is connection-oriented; UDP is connectionless C.) Both TCP and UDP are connection-oriented, but only TCP uses windowing D.) TCP and UDP both have sequencing, but UDP is connectionless  4
Which IP host address range is allowable given an IP address of 172.37.2.56 and 12 bits of subnetting A. 172.37.2.48 to 172.37.2.63 B. 172.37.2.48 to 172.37.2.62 C. 172.37.2.49 to 172.37.2.62 D. 172.37.2.49 to 172.37.2.63 E. 172.37.2.55 to 172.37.2.126  1
 
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