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A Frequently Asked CCNA Interview Questions


CCNA is an associate-level certification that validates your skills to fix, configure and troubleshoot enterprise network issues. The accreditation is hosted by Cisco, a prominent vendor of network equipment that holds the market’s largest share. – PowerPoint PPT presentation

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Title: A Frequently Asked CCNA Interview Questions

A Frequently Asked CCNA Interview Questions
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CCNA is an associate-level certification that
validates your skills to fix, configure and
troubleshoot enterprise network issues. The
accreditation is hosted by Cisco, a prominent
vendor of network equipment that holds the
markets largest share. Many big enterprises use
Ciscos equipment in their network
infrastructure. Therefore, CCNA certification can
be instrumental in getting job opportunities in
the IT sector as a networking professional. As a
certified networking expert, you may find
opportunities for the Network Support Engineer,
Technical Support Engineer, Network and System
Administrator, Hardware and Networking Engineer,
etc. If you are looking ahead to preparing for
the CCNA Interview, then you are at an accurate
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Here are the 20 most common CCNA Interview
Questions and Answers that may help you crack
your interview earn your dream career in the
networking field 1) What do you understand by
the OSI model in networking?Answer OSI model
stands for open systems interconnection model. It
is a reference model that shows how applications
communicate in a network. It consists of 7
layers. Layer 1 Physical Layer 2 Datalink Layer
3 Network Layer 4 Transport Layer 5
Session Layer 6 Presentation Layer 7
Application 2)WhatisRIP?Answer  RIP stands for
Routing Information Protocol and is also known as
Interior Gateway Protocol (IGP). It is a
distance-vector protocol that uses hop count as a
routing metric to find the most suitable path
between the sender and the receiver.
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3) What is the difference between a collision
domain and a broadcast domain?Answer Collision
domain  If two devices try to send data
simultaneously, a collision will occur leading
them to wait and re-transmit the data. So, when
two devices in a network send information the
collision domain has to take care of all the
devices connected in the network whether it is
destined for them or not. It happens only in the
case of a half-duplex mode. Broadcast domain It
is the logical division of the network domain in
which information is broadcasted in the network.
A broadcast domain contains all devices that
receive broadcast traffic from each
other. 4) What are Half-duplex and Full-duplex
transmission modes?Answer Half-duplex In a
point-to-point system, two devices are connected
using a network cable, and these devices can
communicate with each other in both directions
but only in one direction at a time. Full-duplex 
In a point-to-point system, two devices are
connected using a network cable, and these
devices can apprise with each other in both
directions at the same time.
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5) Explain the public vs. private IP
addressing.Answer Public IP is the IP address
that can be accessed over the Internet like a web
server or an email server. The public IP address
on your computer allows you to secure your own
server such as VPN, FTP, WEB, etc. With the help
of public IP, you can set up any home server to
publish it on the Internet. The private
IP address of a system is the IP address that is
used to communicate within the same network.
Private IPs are not loaded on the Internet, and
no data cannot be sent to them from the Internet
it only works within the local network. 6) What
is the difference between Unicast, Multicast,
Broadcast, and Anycast?Answer In a
unicast transmission, a single data packet is
sent from the source to a single destination on
the network. In broadcast, a single data packet
is sent to all destinations on the
network. Multicast is like broadcast but, in
multicast, you have to be a member of the
multicast group. In anycast, the data is sent to
the nearest node within the network and that node
then initiates another anycast to its nearest
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7) How are straight-through and crossover cables
different from each other?Ans
Straight-through You can use it when you want to
connect two different types of devices. It is the
most commonly used cable format for network
cables. It helps to connect a routers WAN port
to a LAN port. Crossover Cable You can use a
crossover cable when you want to connect two
devices of the same type. It is used only for
specific applications. You can connect two hubs
or switches by using the normal port in both hubs
or switches. 8) Explain what NOS is.Ans A NOS
(Network Operating System ) is an operating
system that manages network resources like an
operating system that involves special functions
for connecting computers and devices into a local
area network. Example Windows server 2019, Linux
server, etc 9) Explain different categories of
Ethernet. Answer Ethernet Different categories
are Ethernet (10 Mbps) Fast Ethernet (100
Mbps) Gigabit Ethernet (1000 Mbps) 10 Gigabit
Ethernet (up to 10 billion bits per second)

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10) What are Data Encapsulation and
De-Encapsulation?Answer When data is sent, each
layer adds some extra information like protocol
information, IP addresses, MAC addresses for the
data to reach its destination. It is called
Encapsulation. When data is received, each layer
will shred the information attached in the header
and trailer from the encapsulated frame it is
called De-Encapsulation. 11) What are the
different topologies in networking?Answer  The
types of networking topologies are Bus Each
node is connected to a single cable also known as
backbone. Star Each node is connected to a
centralized hub/switch. Mesh All nodes are
interconnected to each other so if one path fails
data can still be transferred. Ring Each node is
connected to its adjacent ones forming the shape
of a ring. 12) What are the different types of
cables that are used in routing?Answer Three
different types of cables are used in
routing Straight-through cable
(switch-router) Crossover cable (PC-PC,
switch-switch) Rollover cable (Console port to a
computer) 13) What are Static routing and
Dynamic routing?Answer  Static routing Static
Routing is a user-defined routing technique. In
this manual selection of a network, routes are
managed by the network administrator and ideal
for small networks. It does not use complex
routing algorithms and is more secure than
Dynamic routing.

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Dynamic routing Dynamic routing is a networking
mechanism that enables routers to select paths
using routing protocols and routes are updated
according to the changes in the network. It is
ideal for large networks. It uses complex routing
algorithms and it does not provide high security
like static routing. 14) Differentiate Domain
and workgroup.Ans Domains have one or more
computers that act as servers. It has centralized
databases. Domain computers can be on different
LANs. The workgroup consists of computers that
are peers. In a workgroup, each computer has its
own database and is on the same LAN. 15) What is
Kerberos protocol?Ans Kerberos is a network
authentication protocol that is based on
time-sensitive ticket-granting-system designed to
produce strong authentication for client or
server applications using symmetric key
cryptography. 16) What is DHCP in
networking?Answer Dynamic Host Configuration
Protocol (DHCP) is a network protocol that is
used on IP networks where a DHCP server provides
and assigns IP addresses to client devices. DHCP
also assigns the subnet mask, default gateway
address, and the Domain Name Server (DNS) address.

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17) What is the Domain Name System
(DNS)?Answer DNS is a database that stores
domain names and their respective IP addresses
for a specific top-level domain (TLD)  such as
.com and .net. It finds the computer systems and
assets on the web. 18) What is
HSRP?Answer HSRP stands for the Hot Standby
Router Protocol developed by Cisco to provide
gateway-level redundancy without any additional
configuration. All the routers in an HSRP group
distribute a single MAC address and IP address
that works as a default gateway to the local
network. 19) Why is the MAC address called the
Physical address?Ans MAC address is called the
physical address because we can not change the
value of MAC address. MAC address is an exclusive
address to identify devices which is provided by
the hardware manufacturer. It is of 48 bits, 12
characters separated by dots or hyphens. CCNA
training with Infosec TrainInfosecTrain is one
of the leading IT security training providers. We
offer a comprehensive training program for CCNA
Certification. If you want to take the experts
help in getting through the CCNA certification
exam, check this CCNA certification training
course offered by InfosecTrain Cisco CCNA
200-301 Certification training

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