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 CCNA interview questions  CCNA Interview Questions
 CCDA interview questions  CCDA Interview Questions
Question
What is VLSM? Why we Create? When we Create? Implement VLSM 
with example?
 Question Submitted By :: Kapilasdhir
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What is VLSM? Why we Create? When we Create? Implement VLSM with example?
Answer
# 1
VLSM Stands for Variable Length Subnet mask.This method is 
an advanced version of IP Subnet Zero Method of Subnetting.
It  is used to reduce the wastege of IP address over a WAN
 
Is This Answer Correct ?    9 Yes 2 No
Inder Gulati
 
  Re: What is VLSM? Why we Create? When we Create? Implement VLSM with example?
Answer
# 2
VLSM is used for proper implimentation of IP addresses 
without any loss.In real world this is used by the ISP to 
Distribute the public Ip when asssigning the WAN links.
Basically companys who requires WAN link we need to use 2 
IP addresses ,One at our terminal and another in ISP 
terminal.But a single Class C address provides 254 valid 
host addressses what to do with rest 252 addresses.Throgh 
VlSM we can use it in 2 Valid host per subnet.Rest of all 
addresses can also be distributed with a Separate block 
size or 6,14,30,62 hst per subnet.
 
Is This Answer Correct ?    7 Yes 1 No
Asish Mishra
 
 
 
  Re: What is VLSM? Why we Create? When we Create? Implement VLSM with example?
Answer
# 3
Allows for the creation of efficient, scalable addressing
schemes.
One of the modifications that has helped to bridge the gap
between IPv4 and IPv6 (128bit)
RIP V1 for small networks – RIP V2 scalable by using VLSM
With VLSM, a network administrator can use a long mask on
networks with few hosts, 
and a short mask on subnets with many hosts
 
Is This Answer Correct ?    1 Yes 0 No
Shahid Ahmed
 

 
 
 
Other CCNA Interview Questions
 
  Question Asked @ Answers
 
Which layer is responsible for coordinating communication between systems? A.) Application B.) Network C.) Session D.) Transport E.) Physical F.) Data Link  1
Which OSI Reference Layer is concerned with logical addressing? A.) Network B.) Transport C.) Datalink D.) Physical E.) Session  1
Identify the prompt displayed if in privileged exec mode? A.) Router(config)# B.) Router# C.) Router> D.) Router(priv)#  1
What was the key reason the International Organization for Standardization released the OSI model? A. users could access network servers faster B. different vendor networks could work with each other C. the industry could create a standard for how computers work D. network administrators could increase the overall speed of their network  1
What is the default interval for SAP updates? A.) 60 seconds B.) 15 seconds C.) 30 seconds D.) 120 seconds ACS1
Identify the 2 commands the saves the running-config to NVRAM? A.) write memory B.) copy running-config startup-config C.) write network D.) write backup  1
What is the IP extended access list range? A.) 1000-1099 B.) 100-199 C.) 1-99 D.) 101-200  2
Which layer allows multiple Ethernet devices to uniquely identify one another on the Datalink layer? A.) Transport B.) Session C.) Network D.) Datalink - MAC Sublayer E.) Datalink - LLC Sublayer  1
What is public and private ip address., explain? and also explain the ip address range of both public and private? and where we use that public and private ip address?  8
What is the default encapsulation and frame type on an Ethernet interface when enabling Novell? A.) SNAP B.) Ethernet_II C.) 802.2 D.) 802.3 E.) SAP F.) Novell-ether  1
Identify the command that saves the configuration stored in RAM to NVRAM? A.) copy running-config startup-config B.) copy tftp running-config C.) copy startup running D.) copy active to backup  2
Identify the 2 methods to modify the routers boot sequence? A.) Setup program B.) Boot system commands C.) RXBoot D.) Config-register  1
Put the following steps of encapsulation into the correct order: 1) The data is broken into segments to be organized 2) Frames are converted to 1s and 0s to be put on the wire 3) Packets are converted into frames 4) Information that users enter is converted into data 5) The segments are changed to packets to be routed A.) 4, 1, 3, 2, 5 B.) 4, 5, 1, 3, 2 C.) 2, 3, 1, 4, 5 D.) 4, 1, 5, 3, 2  1
What command can you type to view the connections after telneting into multiple routers simultaneously? A.) sh users B.) sh ports C.) sh host D.) sh sessions  1
What is the protocol number for UDP? A.) 6 B.) 17 C.) 25 D.) 21  1
Which OSI layer end to end communication, segmentation and re-assembly? A.) Network B.) Transport C.) Physical D.) Application E.) Data-Link F.) Presentation  1
Identify the 3 characteristics of IGRP? A.) Uses hop count as a metric B.) Supports multiple unequal paths C.) Administrative distance is 100 D.) Configured with an Automous system number E.) Link state  1
Which two statements are true? (Choose two) A. Ethernet 802.3 utilizes a half duplex method for data transfer B. In a 100 MBS point to point connection a full duplex connection can provide 400 Mbs of data transfer C. Ethernet switches can use the full duplex mode to connect multiple nodes on a single pod of a switch D. Full duplex Ethernet takes advantage of UTP using one pair for transmission and the other pair for reception  1
Which OSI layer performs code conversion, code formatting and encryption? A.) Physical B.) Data-Link C.) Application D.) Transport E.) Presentation F.) Network  1
What was the key reason the International Organization for Standardization released the OSI model? A. users could access network servers faster B. different vendor networks could work with each other C. the industry could create a standard for how computers work D. network administrators could increase the overall speed of their network  1
 
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