Mostly Asked Network Engineer Interview Preparation Guide

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There are many reasons for this choice. It is a perspective area with bright future and great possibilities of career growth. The salaries for engineers are exceptional too. What more, the competition is not so tough like in other fields.
☛ Exceptional computer intelligence and great predispositions to become a network engineer
☛ Love to do the job, motivation and enthusiasm for doing it
☛ Belief in huge perspective of this field nowadays.

"I love to work with networks. I liked it since my childhood. I was an administrator of local network we had back then. I believe this area is very perspective and important in society, because we have networks everywhere right now. To work on the security and effectiveness of it makes me proud and happy in my daily life."

There are many ways to discover network topology and most of the ways you know determine your experience in the field. First, you can ping random IP addresses. If you do a tracert, you can discover router IP addresses. You can install a network traffic packet analyzer to read some of the traffic that passes between segments of the network. You can run an SNMP scanner and attempt to find open systems. Even at a basic level, you can plug a laptop into open data ports to see if you can connect to various servers and other desktops.

There are several ways to improve network performance. You can first make sure you disable peer-to-peer downloading and torrents. Some companies restrict media streaming such as YouTube and Pandora. You can also add compression to files to reduce the amount of bandwidth used. Another area where some network admins make mistakes is timed backups and large data transfers. Make sure your backups are done during slow network times, which is usually overnight when the office is closed.

The obvious answer to this question is yes or no, but you should elaborate if the answer is yes. Most networking environments use a combination of Windows and Linux servers and desktops. Usually, network engineers prefer Linux servers and work with Windows and Linux desktops. Occasionally, you might have some Mac desktops as well to work with.

It is a very simple protocol used for transmission of IP data-grams across a serial line.

It is a simple protocol used to exchange information between the routers.

It is a sequence of IP addresses identifying the route a datagram must follow. A source route may optionally be included in an IP datagram header.

It is using a router to answer ARP requests. This will be done when the originating host believes that a destination is local, when in fact is lies beyond router.

It is an Internet routing protocol that scales well, can route traffic along multiple paths, and uses knowledge of an Internet's topology to make accurate routing decisions.

It is an authentication service developed at the Massachusetts Institute of Technology. Kerberos uses encryption to prevent intruders from discovering passwords and gaining unauthorized access to files.

It is a host that has a multiple network interfaces and that requires multiple IP addresses is called as a Multi-homed Host.

It is a set of rules defining a very simple virtual terminal interaction. The NVT is used in the start of a Telnet session.

It is a protocol formerly used to exchange routing information between Internet core routers.

It is a protocol used to advertise the set of networks that can be reached with in an autonomous system. BGP enables this information to be shared with the autonomous system. This is newer than EGP (Exterior Gateway Protocol).

It is a collection of routers under the control of a single administrative authority and that uses a common Interior Gateway Protocol.

It is the protocol the routers in neighboring autonomous systems use to identify the set of networks that can be reached within or via each autonomous system.

It is any routing protocol used within an autonomous system.

It is a system that performs a protocol translation between different electronic mail delivery protocols.

Wide-mouth frog is the simplest known key distribution center (KDC) authentication protocol.

IDEA stands for International Data Encryption Algorithm.

Packet filter is a standard router equipped with some extra functionality. The extra functionality allows every incoming or outgoing packet to be inspected. Packets meeting some criterion are forwarded normally. Those that fail the test are dropped.

One of the main causes of congestion is that traffic is often busy. If hosts could be made to transmit at a uniform rate, congestion would be less common. Another open loop method to help manage congestion is forcing the packet to be transmitted at a more predictable rate. This is called traffic shaping.

When hierarchical routing is used, the routers are divided into what we will call regions, with each router knowing all the details about how to route packets to destinations within its own region, but knowing nothing about the internal structure of other regions.

It is a problem that can ruin TCP performance. This problem occurs when data are passed to the sending TCP entity in large blocks, but an interactive application on the receiving side reads 1 byte at a time.

The most common two letter combinations are called as digrams. e.g. th, in, er, re and an. The most common three letter combinations are called as trigrams. e.g. the, ing, and, and ion.