1. Why did you choose career in network engineering?
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."
2. How can you describe network topology?
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.
3. Do you know about some basic ways to speed up network performance?
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.
5. Tell me what is SLIP (Serial Line Interface Protocol) in network engineering?
It is a very simple protocol used for transmission of IP data-grams across a serial line.
6. Tell me what is RIP (Routing Information Protocol)?
It is a simple protocol used to exchange information between the routers.
7. Do you know what is source route?
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.
8. What is Proxy ARP in network engineering?
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.
10. What is Kerberos in network engineering?
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.
11. What is the mean of multi-homed host in network engineering?
It is a host that has a multiple network interfaces and that requires multiple IP addresses is called as a Multi-homed Host.
12. What is NVT (Network Virtual Terminal) in network engineering?
It is a set of rules defining a very simple virtual terminal interaction. The NVT is used in the start of a Telnet session.
13. What is gateway-to-gateway protocol in network engineering?
It is a protocol formerly used to exchange routing information between Internet core routers.
14. What is the mean of BGP (Border Gateway Protocol)?
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).
15. What is autonomous system in network engineering?
It is a collection of routers under the control of a single administrative authority and that uses a common Interior Gateway Protocol.
16. What is EGP (Exterior Gateway Protocol) in network engineering?
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.
17. What is IGP (Interior Gateway Protocol) in network engineering?
It is any routing protocol used within an autonomous system.
18. What is mail gateway in network engineering?
It is a system that performs a protocol translation between different electronic mail delivery protocols.
19. What is wide-mouth frog in network engineering?
Wide-mouth frog is the simplest known key distribution center (KDC) authentication protocol.
20. IDEA in network engineering stands for?
IDEA stands for International Data Encryption Algorithm.
21. What is packet filter in network engineering?
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.
22. What is traffic shaping in network engineering?
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.
23. What is region in network engineering?
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.
24. Tell me about silly window syndrome?
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.
25. Can you please explain the difference between Digrams and Trigrams?
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.
26. What is virtual path in network engineering?
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.
27. What is logical link control in network engineering?
One of two sub-layers of the data link layer of OSI reference model, as defined by the IEEE 802 standard. This sub-layer is responsible for maintaining the link between computers when they are sending data across the physical network connection.
28. What is virtual channel in network engineering?
Virtual channel is normally a connection from one source to one destination, although multicast connections are also permitted. The other name for virtual channel is virtual circuit.
29. Why should one care about the OSI Reference Model?
Because it provides a framework for discussing network operations and design.
30. Can you please explain the difference between routable and non- routable protocols?
Routable protocols can work with a router and can be used to build large networks. Non-Routable protocols are designed to work on small, local networks and cannot be used with a router.
31. What is MAU in network engineering?
In token Ring , hub is called Multistation Access Unit(MAU).
32. What is 5-4-3 rule in network engineering?
In a Ethernet network, between any two points on the network ,there can be no more than five network segments or four repeaters, and of those five segments only three of segments can be populated.
33. Can you please explain the difference between baseband and broadband transmission?
In a base-band 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.
34. Describe the mesh network?
A network in which there are multiple network links between computers to provide multiple paths for data to travel.
35. List the important topologies for networks?
☛ BUS topology: In this each computer is directly connected to primary network cable in a single line.
☷ Advantages: Inexpensive, easy to install, simple to understand, easy to extend.
☛ STAR topology: In this all computers are connected using a central hub.
☷ Advantages: Can be inexpensive, easy to install and reconfigure and easy to trouble shoot physical problems.
☛ RING topology: In this all computers are connected in loop.
☷ Advantages: All computers have equal access to network media, installation can be simple, and signal does not degrade as much as in other topologies because each computer regenerates it.
