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Top 20 Networking Interview Questions & Answers You Must Know

Tue, 2017-03-21 17:20
Networking Interview Questions

Here we are presenting some networking interview questions from beginner to advanced questions and their adequate answers and explanations.

These questions will help you in preparing for an interview and reviewing all the important topics that are needed to be known by beginners as well as professionals in Networking.

In this blog we cover the valuable information on the concepts of Network Cards, Cabling, Topologies and Protocol Suites, Network Services and Communication Devices, Managing Client and Server Computers, TCP/IP Administration, IOS Reference Model, LAN’s Bridges and Switches and TCP/IP and IP Routing, Routing and Routing Protocol, WAN Protocol and Security.

Networking Interview Questions and Answers

  1. What is a Link?
  2. Answer: A link refers to the connectivity between two devices. It includes the type of cables and protocols used in order for one device to be able to communicate with the other.

  1. Define Network?
  2. Answer: A network is a set of devices connected by physical media links. A network is recursively is a connection of two or more nodes by a physical link or two or more networks connected by one or more nodes.

  1. Describe Domain Name System.
  2. Answer: There are two types of client/server programs.
    First is used directly by the user, such as e-mail, second supports other application programs. The Domain Name System (DNS) is a supporting program that is used by other programs such as to find the IP address of an e-mail recipient.

  1. Have you worked in heterogeneous environments and multiple server and client platforms?
  2. Answer: 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.

  1. What is a LAN?
  2. Answer: LAN is short for Local Area Network. It refers to the connection between computers and other network devices that are located within a small physical location.

  1. What is Multiple Access?
  2. Answer: If the physical links are shared by more than two nodes, it is said to be Multiple Access.

  1. Define Fully Qualified Domain Name and Partially Qualified Domain Name.
  2. Answer: In hierarchical name space, names are defined in an inverted-tree structure with the root at the top. The tree can have only 128 levels: level 0 (root) to level 127.
    Each node in the tree has a label, which is a string with a maximum of 63 characters.
    The root label is a null string (empty string). In this tree, all the labels have different name, which guarantee the uniqueness of the domain names.
    A full domain name is a sequence of labels separated by dots (.). The domain names are always read from the node up to the root.
    Fully Qualified Domain Name
    If a label is terminated by a null string or empty string, it is called a fully qualified domain name (FQDN).
    Partially Qualified Domain Name
    If a label is not terminated by a null string, it is called a partially qualified domain name (PQDN). A PQDN starts from a node, but it does not end with the root.

  1. How do you work with a development team?
  2. Answer: Interestingly, most infrastructure and development teams don’t get along well with each other. When development teams and infrastructure teams get together to design large systems, they usually disagree with each other. There can be a lot of tension between the two departments. When you answer this question, make sure you give an answer that attempts to help a development team and facilitates progress instead of stifles it. You want to help developers complete projects while securing the network in the best way possible.

  1. What are the advantages of Distributed Processing?
  2. Answer:

    a. Security/Encapsulation
    b. Distributed database
    c. Faster Problem solving
    d. Security through redundancy
    e. Collaborative Processing

  1. What is anonymous FTP?
  2. Answer: Anonymous FTP is a way of granting user access to files in public servers. Users that are allowed access to data in these servers do not need to identify themselves, but instead log in as an anonymous guest.

  1. What are the layers of the OSI reference model?
  2. Answer: There are 7 OSI layers: Physical Layer, Data Link Layer, Network Layer, Transport Layer, Session Layer, Presentation Layer and Application Layer.

  1. What is a node?
  2. Answer: A network can consist of two or more computers directly connected by some physical medium such as coaxial cable or optical fiber. Such a physical medium is called as Links and the computer it connects is called as Nodes.

  1. Describe Hierarchical Namespace.
  2. Answer: In a hierarchical name space, each name is combination of several parts as:
    Type of the organization.
    Name of an organization.
    Departments in the organization.
    A central authority can assign the part of the name that defines the nature and name of the organization. The other things of the name the organization provides itself. The organization can add suffixes (or prefixes) to the name to define its host.
    The company need not worry about the prefix if it is same as that of another organization because, even if part of an address is the same, the whole address is different.

  1. What tools do you use to troubleshoot network issues?
  2. Answer: You can use any tools to troubleshoot issues, but you should mention some internal typical commands that help troubleshoot standard problems. For instance, if the user can’t access the Internet, you might want to run a tracert on the problem. You could also use ping to see if the user can access internal areas of the network. Of course, there could also be hardware issues such as a bad network card or broken cable.

  1. What is point-point link?
  2. Answer: If the physical links are limited to a pair of nodes it is said to be point-point link.

  1. What things should you consider when you work with several departments and large infrastructures?
  2. Answer: One main issue with larger businesses is security. If the business hosts its own web host servers, you must understand how to protect the internal network from outside Internet traffic. Other issues include user management and desktop audits and inventory. You must be able to manage several desktops and servers at once.

  1. What are the criteria necessary for an effective and efficient network?
  2. Answer:
    a: Performance
    It can be measured in many ways, including transmit time and response time.
    b: Reliability
    It is measured by frequency of failure, the time it takes a link to recover from a failure, and the network's robustness.
    c: Security
    Security issues include protecting data from unauthorized access and viruses.

  1. What is subnet mask?
  2. Answer: A subnet mask is combined with an IP address in order to identify two parts: the extended network address and the host address. Like an IP address, a subnet mask is made up of 32 bits

  1. What is a gateway or Router?
  2. Answer: A node that is connected to two or more networks is commonly called as router or Gateway. It generally forwards message from one network to another.

  1. What are some basic ways to speed up network performance?
  2. Answer: 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.

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Hitesh Patel
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