Latest CCNA Interview Questions Part- 4
1.What is an ip address?
An IP address is a numeric identifier assigned to each machine on an IP network. It designates the location of a device on the network.
2.What is PING utility?
PING – Packet Internet Gopher A utility that verifies connections to one or more remote hosts. The ping command uses the ICMP echo request and echo reply packets to determine whether a particular IP system on a network is functional. Ping is useful for diagnosing IP network or router failures.
3.What is Subnetting?Why is it used?
Used in IP Networks to break up larger networks into smaller subnetworks. It is used to reduce network traffic,Optimized network performance,and simplify management i.e. to identify and isolate network problems.
4.Difference between the Communication and Transmission?
Communication is the process of sending and receiving data by means of a data cable that is connected externally. Transmission means the transfer of data from the source to the destination.
5.What are 10Base2,10Base5 and 10BaseT Ethernet LANs?
10Base2 an Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling,with a contiguous cable segment length of 200 meters (185mts). Known as Thinnet. 10Base5 an Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses baseband signaling,with a contiguous cable segment length of 500 meters. Known as Thicknet.
10BaseT an Ethernet term meaning a maximum transfer rate of 10 Megabits per second that uses two pairs of twisted-pair baseband signaling,with a contiguous cable segment length of 100 meters.
6.What are the possible ways of data exchange?
1. Simplex
2. Half-duplex
3. Full-duplex
7.What is difference between Baseband and Broadband Transmission?
In a baseband transmission,the entire bandwidth of the cable is consumed by a single signal. In broadband transmission,signals are sent on multiple frequencies,allowing multiple signals to be sent simultaneously.
8.What is Passive Topology?
When the computers on the network simply listen and receive the signal,they are referred to as passive because they don’t amplify the signal in any way.
9.How Gateway is different from Routers?
Gateway A device connected to multiple physical TCP/IP networks capable of routing or delivering IP packets between them. Router,It’s a layer 3 device that connects 2 different networks and routes packets of data from one network to another. It breaks up Broadcast domain as well as Collision Domain.
10.What is Brouter?
It’s a Hybrid device that combines the features of both bridges and routers.
11.What is Frame relay,in which layer it comes?
Frame relay is an industry standard,shared access,switched Data Link Layer encapsulation that services multiple virtual circuits and protocols between connected mechanism. Frame relay is a packet-switched technology..
12.What is Beaconing?
An FDDI frame or Token Ring frame that points to serious problem with the ring,such as a broken cable. The beacon frame carries the address of the station thought to be down.
13.What is ICMP?
It is a Network Layer Internet protocol,which can report errors and status information. We can use the ping command to send ICMP echo request messages and record the receipt of ICMP echo reply messages. With these messages,we can detect network or host communication failures and troubleshoot common TCP/IP connectivity problems.
14.What is difference between ARP and RARP?
ARP – Address Resolution Protocol The protocol that traces IP addresses to MAC addresses. RARP – Reverse Address Resolution Protocol The protocol within the TCP/IP stack that maps MAC addresses to IP addresses.
15.What is the difference between TFTP and FTP application layer protocols?
TFTP – Trivial File Transfer Protocol A stripped down version of FTP,easy to use and fast. TFTP has no Directory browsing,no Authentication and insecure it can only send and receive files. FTP – File Transfer Protocol The TCP/IP protocol used for transmitting files between network nodes. FTP allows access to both Directories and files,manipulating directories,typing file contents and copying files between hosts.
16.What is logical link control?
One of two sublayers of the data link layer of OSI reference model,as defined by the IEEE 802 standard. This sublayer is responsible for error detection but not correction,flow control and framing.
17.What is Virtual Path?
Along any transmission path from a given source to a given destination,a group of virtual circuits can be grouped together into what is called path.
18.What is the difference between interior and exterior neighbour gateways?
Interior gateways connect LANs of one organization,whereas exterior gateways connect the organization to the outside world.
19.What is a DNS resource record?
A resource record is an entry in a name server’s database. There are several types of resource records used,including name-to-address resolution information. Resource records are maintained as ASCII files.
20.Which of the three switching methods is fastest,and why?
ICut-Through switching is the fastest method because the switches read only the first six bytes of the frame before forwarding it.
21.What is designated router?
An OSPF router that creates LSAs for a multi-access network and is required to perform other special tasks in OSPF operatiions. Multi-access OSPF networks that maintain a minimum of two attached routers identify one router that is chosen by the OSPF Hello Protocol,which makes possible a decrease in the number of adjacencies necessary on a multi-access network. This in turn reduces the quantity of routing protocol traffic and the physical size of the database
22.What is CSMA/CD?
Carrier Sense Multiple Access with Collision Detection: A technology defined by the Ethernet IEEE 80
2.3 committee. Each device senses the cable for a digital signal before transmitting. Also CSMA/CD allows all devices on the network to share the same cable,but one at a time. If two devices transmit at the same time,a frame collision will occur and a jamming pattern will be sent,the devices will stop transmitting,wait a predetermined as well as a self-imposed random amount of time,and then try to transmit again.
23.What is CSU/DSU?
Channel service unit/data service unit: Physical layer device used in wide area networks to convert the CPE digital signals to whatis understood by the provider’s switch. A CSU/DSU is typically one device that plugs into a RJ-45 jack,known as the demarcation point.
24.What is connection oriented services?
Data transfer method that sets up a virtual circuit before any data is transferred. USes acknowledgements and flow control for reliable data transfer.
25.What is collision domain?
The network area in ethernet over which frames that have collided will be detected. Collision are propagated by hubs and repeaters,but not by LAN switches,routers,or bridges.
26.Explain about Session layer in OSI model?
The session layer is responsible for setting up,managing and then tearing down sessions between Presentation Layer entities. This Layer also provides dialogue control between devices,or nodes. It coordinates communication between systems and serves to organize their communication by offering there different modes like simplex,half duplex,and full duplex .
27.Explain Presentation layer in OSI model?
Presentation layer is a Layer 6 of the OSI reference model,this layer is essentially a translator and provides coding and conversion function. It presents data to the application layer and is responsible for data translation and code formatting. That means it defines how data is formatted,presented,encoded,and converted for use by software at the Application Layer.
28.Why do we need to subtract two from number of hosts?
The hosts part cannot be all one’s or all zero’s,so these two possibilities are subtracted from the outcome. All one’s reserved for broadcast id and all zero’s are local network. We cannot use this. That’s why we subtract two from the hosts.
29.Can you explain the concept of VLSM?
Variable Length Subnet Masking – VLSM – is a technique that allows network administrators to divide an IP address space into subnets of different sizes,unlike simple same-size Subnetting. Variable Length Subnet Mask (VLSM) in a way,means subnetting a subnet.
To simplify further,VLSM is the breaking down of IP addresses into subnets (multiple levels) and allocating it according to the individual need on a network. It can also be called a classless IP addressing. A classful addressing follows the general rule that has been proven to amount to IP address wastage.
30.Explain about superneting?
Superneting refers to increase host and reduce the subnet’s. It mean reduce the network bits and increase the host bits. We do use supernetting because when the PCs in the network increase where we need the more valid IP’s in the same network.