CCNA Interview Question and Answer

ccna interview question and answer

January 22,2018, | By Innovative Academy

 





> Straight through cable and Crossover cable.

> It is a five layered model which provides guidelines for the development of universally compatible networking protocols. The five layers are physical, data link, network, transport and application.

> Multiplexing is the process of dividing a link, the physical medium, into logical channels for better efficiency. Here medium is not changed but it has several channels instead of one.

> Analog signals can have an infinite number of values in a range but digital signal can have only a limited number of values.

> The range of frequencies that a medium can pass is called bandwidth. It is the difference between the highest and lowest frequencies that the medium can satisfactorily pass.

> Errors can be categorized as a single-bit error or burst error. A single bit error has one bit error per data unit. A burst error has two or more bits errors per data unit.

> It is a protocol converter.A gateway can accept a packet formatted for one protocol and convert it to a packet formatted for another protocol.It operates on all the seven layers of OSI model.

> The protocols defined in application layer are:
  • TELNET.
  • FTP.
  • SMTP.
  • DNS.

> The protocols defined in transport layer are:
  • TCP.
  • UDP.

> It is a standard for specifying any kind of information on the World Wide Web.

> There are two types, namely IPv4 and IPv6.IPv4- 32bit address and IPv6-128 bit address.

> 127.0.0.1 is used for loopback address and also for local testing purposes.Loopback means looping to our own systems, checking our own systems. It is used to test whether TCP/IP stack is correctly installed.

> It is the mode of communication between two devices in which flow of data is unidirectional. i.e. one can transmit and other can receive. E.g. keyboard and monitor.

> Show run/show running-config

  • Class a- 10.0.0.0 to 10.255.255.255.
  • Class b- 172.16.0.0 to 172.31.255.255.
  • Class c- 192.168.0.0 to 192.168.255.255.

> The subnet mask of 192.168.100.1/28 is 255.255.255.240.

> IPv6 unicast-routing.

> When the topology enables the computers on the network only to simply listen and receive the signals, it is known as passive topology because they don't amplify the signals any way.

> No, you cannot assign IP addresses on layer 2.

> Latency is the amount of time delay. It is measured as the time difference between at the point of time when a network receives the data and the time it is sent by another network.

> PoE is said to be Power over Ethernet. It is used pass electric signal with data at a time.

> MAC address stands for Media Access Control address. This is an address of a device which is identified as the Media Access Control Layer in the network architecture. The MAC address is unique and usually stored in ROM.

> It is an electronic down bridge which is used to enhance the security of a network. It's configuration has two components. i)Two routers ii)Application gateway the packets traveling through the LAN are inspected here and packets meeting certain criteria are forwarded and others are dropped

> Sub-netting divides one large network into several smaller ones. It adds an intermediate level of hierarchy in IP addressing.

> Redundancy is the concept of sending extra bits for use in error detection. Three common redundancy methods are parity check, cyclic redundancy check (CRC), and checksum.


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