Continuing with our series of Question Banks of various core companies of ECE, we have now collected the following questions asked in interviews of Cisco Systems. These questions will help you prepare for on-campus and off-campus interviews of Cisco. Let’s take a look at them…
Q : What is gateway?
A : Gateway is a piece of networking hardware that acts as an entry point to another network. It is used for interfacing with another network that uses different protocols.
Q : What do you mean by a default gateway? Give a real-life example.
A : It is a device that passes traffic from the local subnet to devices on other subnets, often used to connect a local network to the Internet (even though internal gateways for local networks also exist). In a home network with a broadband router sharing the Internet connection, the home router serves as the default gateway.
Q : Explain VLAN.
A : VLAN (Virtual LAN) is a group of flexible logical devices (instead of physical ones) connected to one or more LANs (Local Area Networks) and are configured to communicate just like they were attached to the same wire but are actually located on a number of different LAN segments.
Q : What is Trunk port? Why is it needed?
A : Trunk port is a kind of port that is responsible for carrying traffic for all the VLANs that are accessible by a specific switch by a process called trunking. Trunk ports mark frames with uniquely identifying tags (either 802.1Q tags or ISL (Inter Switch Link) tags) as they move between switches. Thus, every single frame can be directed to its designated VLAN.
Q : What do mean by NAT?
A : NAT (Network Address Translation) is the process of re-mapping an IP address space into another one by making modifications in the network address information in IP (Internet Protocol) datagram packet headers while they are moving across a traffic routing device.
Q : What is pipelining?
A : Pipelining is the process of en-queuing the next process to be executed while the current process is still under execution.
Q : At which OSI layer does the retransmission of packets take place?
A : The retransmission of packets takes place in the Network layer of OSI model.
(Continued to Part 2…)