Network Operations Analyst Test

Preparing myself for an interview

Layer 1

Physical: Transfers raw bits over a physical medium like cables or switches

Layer 2

Data Link: Controls how data is formatted for the physical layer: this might be a mac address

Layer 3

Network: this handles any type of routing whether it be IP addresses or routers

Layer 4

Transport: Ensures reliable data transfer which could be TCP/UDP or error recover

Layer 5

Session: Manage Sessions and connections between devices: start maintain and end points

Layer 6

Presentation: Translates dates formats (encryptions compressions and encoding)

Layer 7

Interface for end-user applications (web browser, email clients)

What is UDP?

It a connection oriented type of protocol and ensures delivery (Streaming, online gaming, video calls)

What is TCP

It is a connectionless and faster protocol but does not ensure delivery (HTTPS; web browsing, File transfer)

DNS Port number

53

HTTPS port Number

443

SSH Port Number

22

DHCP Port Number

67 (server) 68 (client)

What best describes a router

A router connects multiple networks together while also being apart of the OSI layer 3, it forwards traffic based of an IP address

3 Tools used for networking

Wireshark (a packet analyzer), Solarwinds (network performance), Zabbix (open source network and system networking)

If a user cant access a website what is the first command you run?

Ping,,

A server goes offline. Walk through the steps you’d take to troubleshoot.

Ping the server, check the logs, check the hardware itself, traceroute it or escalate the situation if needed

Which command will show active network connections on a Linux system?

Netstate -tuln (each letter stands for the connections and l means to list and -n is for the numeric order)

What is the purpose of a bashscript in network operations?

To allow for tasks to repetitive like log parsing, network monitioring and service checks

How do you keep up on networking information?

Blogs such as Cisco and Krebs, reddit forums and learning through projects on my virtual machines