Interview Questions Network Engineer

Interview questions Network Engineer

This question allows you to gauge whether the applicant has hands-on experience with networks sized similarly to yours. They don’t necessarily have to be in the same industry or use identical technology to your organization. You’re looking for a general familiarity with the challenges and requirements that come with a company of your size. What to look for:

  • Lots of details
  • Similar sized network
  • Hands-on experience

Example: I created and implemented networks for small business clients that ranged from a two-person operation to 200 people. These networks supported single locations and used a mix of on-premises solutions and cloud-based applications.

This question gives you a first-hand look at the way the applicant approaches a complex problem. There are countless ways to approach this issue, and it’s valuable to see how the applicant goes about it. What to look for:

  • Analytical thinking
  • Solid process
  • Willingness to ask for help

Example: The first thing I do is eliminate any low-hanging fruit. I’ll check for network outages, hardware failures, high network activity and other common causes of poor performance. Once I’ve ruled those out, I’ll use network monitoring and analytics tools to get more information about the cause of the problem. I’ll also reach out to network administrators and technicians to speed up the process if I run into problems.

Bonus: For getting more solid understanding about subnetting consider checking the CCNA 200-301 Course.

eBGP – 20, EIGRP – 5, iBGP – 200

There are 7 OSI layers:

1) Physical Layer

2) Data Link Layer

3) Network Layer

4) Transport Layer

5) Session Layer

6) Presentation Layer

7) Application Layer

Any open standard dynamic routing protocol can be used to connect Cisco devices with non Cisco devices , however , this will require some configuration changes on Cisco devices.
Three-way handshake or a TCP 3-way handshake is a process which is used in a TCP/IP network to make a connection between the server and client.

It is a three-step process that requires both the client and server to exchange synchronization and acknowledgment packets before the real data communication process starts.

VTP is a protocol that carries VLAN information to all switches in the network specifically within the same VTP domain. And also speeds up layer 2 convergence because changes are handled appropriately and timely.

Short for Hot Standby Routing Protocol, a proprietary protocol from Cisco. HSRP is a routing protocol that provides backup to a router in the event of failure.

The routers share the same IP and MAC addresses, therefore in the event of failure of one router, the hosts on the LAN are able to continue forwarding packets to a consistent IP and MAC address. The process of transferring the routing responsibilities from one device to another is transparent to the user.
Ether-channel is a medium which increases network performances on layer 2 by increasing bandwidth for users and servers. Can group together 2-8 fast or gig ports.

To prevent layer 2 loops.

A backbone network is a centralised infrastructure that is designed to distribute different routes and data to various networks. It also handles the management of bandwidth and multiple channels.
LAN stands for Local Area Network. It refers to the connection between computers and other network devices that are located within a small physical location.

Cross over cable is used to connect same type of devices without using a switch/hub so that they can communicate.

Dynamic host configuration protocol (DHCP) is used to allocate IP addresses to large number of PCs in a network environment. This makes the IP management very easy.

DNS is domain naming service and is used for resolving names to IP address and IP addresses to names. The computer understands only numbers while we as humans can easily remember names. So to make it easier for us we assign names to computers and websites.

When we use these names (Like the computer uses DNS to convert to IP address (number) and it executes our request.

Switch sends the traffic to the port to which its meant for. Hub sends the traffic to all the ports.

The command is: ipconfig

From the output we can find out the IP address, DNS IP address, gateway IP address assigned to that computer.
A router is a networking device that forwards data packets between computer networks. Routers perform the traffic directing functions on the Internet. Data sent through the internet, such as a web page or email, is in the form of data packets.

A packet is typically forwarded from one router to another router through the networks that constitute an internetwork (e.g. the Internet) until it reaches its destination node.
A collision domain is the part of a network where packet collisions can occur. A collision occurs when two devices send a packet at the same time on the shared network segment. The packets collide and both devices must send the packets again, which reduces network efficiency.

A broadcast domain is the domain in which a broadcast is forwarded. A broadcast domain contains all devices that can reach each other at the data link layer (OSI layer 2) by using broadcast. All ports on a hub or a switch are by default in the same broadcast domain.
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