Network Administrator

Description

Auto-generated position for Network Administrator

Interview Questions (217)

Q1Can you describe a time when you resolved a critical incident in a network environment?
Experience
Q2If faced with a situation where multiple technical issues arise simultaneously, how would you prioritize your response?
Situational
Q3Can you describe a time when you resolved a critical incident in your previous role?
Behavioral
Q4What steps do you take to ensure the stability and performance of a network?
Technical
Q5If you encountered a major network outage, what immediate actions would you take?
Situational
Q6What motivates you to work in IT support and network management?
Motivational
Q7Can you explain how you managed user accounts and access permissions in Active Directory during your projects?
Technical
Q8What skills should a Network Administrator have?
Experience
Q9What is the process for a device automatically obtaining an IP address?
Technical
Q10What does a Firewall do, and how does it typically decide on what traffic to allow or block?
Technical
Q11How do routers decide on where to send traffic?
Technical
Q12Tell me about a time you caused an outage.
Behavioral
Q13What would you do if you get an assignment that requires you to deal with technologies you haven't seen before?
Situational
Q14What happens when you type example.com?
Technical
Q15How would you troubleshoot if someone called and said the Internet is not working on their laptop?
Situational
Q16What is BGP?
Technical
Q17How does DNS work?
Technical
Q18What is the biggest outage you’ve caused, and what did you learn from that?
Behavioral
Q19Explain how you would explore a network/environment with a single IP and a login, assuming you had no network topology or available other engineer to ask questions to.
Situational
Q20What is the difference between a VLAN and a Subnet?
Technical
Q21What is NAT and how does it work?
Technical
Q22What is your troubleshooting methodology?
Technical
Q23How do you prefer to implement new technologies?
Motivational
Q24What do you consider automation brings to a company?
Motivational
Q25Can you explain how a packet gets from A to B?
Technical
Q26What are a couple of ways you can influence a routing choice in BGP?
Technical
Q27What is the subnet mask of /28?
Technical
Q28What is your procedure to implement new stuff?
Technical
Q29What is your experience with cloud technologies?
Experience
Q30What are network devices? Explain their types.
Technical
Q31What are the different types of computer networks?
Technical
Q32What is a network topology? Explain its types.
Technical
Q33Explain the OSI model, its seven layers, the devices used at each layer, and how it differs from the TCP/IP model.
Technical
Q34What happens to a data packet as it moves through the OSI model?
Technical
Q35What is a VPN? Explain its types.
Technical
Q36Explain the TCP three-way handshake and why TCP uses three handshakes instead of two.
Technical
Q37Explain TCP connection termination, the TIME_WAIT state, and what happens if the final ACK is lost.
Technical
Q38What are TCP sequence numbers and acknowledgment numbers? How do they prevent duplicate packets?
Technical
Q39Explain ARP.
Technical
Q40What is the difference between MAC address and IP address?
Technical
Q41Explain TCP retransmission, Retransmission Timeout (RTO), Fast Retransmit, and Fast Recovery.
Technical
Q42What is the difference between the congestion window (cwnd) and the receive window (rwnd)?
Technical
Q43Explain TCP congestion control, including Slow Start, Congestion Avoidance, and AIMD.
Technical
Q44What is Explicit Congestion Notification (ECN)? How does it improve network performance?
Technical
Q45Compare Tahoe, Reno, New Reno, and Cubic TCP.
Technical
Q46How does TCP distinguish between packet loss caused by congestion and wireless transmission errors?
Technical
Q47Compare Stop-and-Wait, Go-Back-N, and Selective Repeat protocols.
Technical
Q48Why must the Selective Repeat window size be at most half the sequence number space?
Technical
Q49What is the Bandwidth-Delay Product (BDP), and How Does Pipelining Improve Network Performance?
Technical
Q50Compare Distance Vector and Link-State Routing Protocols.
Technical
Q51Why Does RIP Suffer from the Count-to-Infinity Problem, and How Do Split Horizon and Route Poisoning Solve It?
Technical
Q52Why Does OSPF Converge Faster Than RIP? Explain the Dijkstra Algorithm Used in OSPF.
Technical
Q53What is route flapping, and how do routing protocols minimize its impact?
Technical
Q54Explain BGP and Why It Is Called a Path-Vector Protocol.
Technical
Q55What are CIDR (Route Aggregation) and Equal-Cost Multi-Path (ECMP), and Why Are They Useful?
Technical
Q56Differentiate Between Interior Gateway Protocols (IGPs) and Exterior Gateway Protocols (EGPs).
Technical
Q57What is route redistribution in computer networks?
Technical
Q58Why Are Private IP Addresses Not Routable on the Internet?
Technical
Q59What is a Default Gateway?
Technical
Q60Explain NAT and its limitations.
Technical
Q61What is DHCP and explain the DORA process?
Technical
Q62What is APIPA and why is it important?
Technical
Q63Why Does IPv6 Eliminate the Need for NAT?
Technical
Q64Explain IPv6 Neighbor Discovery and How It Replaces ARP.
Technical
Q65Compare CIDR and VLSM.
Technical
Q66How Does a Switch Learn MAC Addresses, and What Happens with an Unknown Destination MAC Address?
Technical
Q67Differentiate between store-and-forward switching and cut-through switching.
Technical
Q68What is the difference between a hub, switch, and router?
Technical
Q69How do Layer 3 switches differ from routers, and when would you choose one over the other?
Technical
Q70What is a collision domain and a broadcast domain?
Technical
Q71Explain the Spanning Tree Protocol (STP) and the Role of the Root Bridge.
Technical
Q72What is VLAN Tagging (IEEE 802.1Q), and Why Is It Used?
Technical
Q73What is PoE (Power over Ethernet)?
Technical
Q74Why Is DNS Hierarchical Instead of Centralized?
Technical
Q75What is DNS cache poisoning and how can it be prevented?
Technical
Q76Explain What Happens When You Enter a URL in a Browser.
Technical
Q77Why Does HTTPS Use TLS Instead of Plain HTTP?
Technical
Q78Compare HTTP/1.1, HTTP/2, and HTTP/3.
Technical
Q79Why Does ICMP Not Use TCP?
Technical
Q80Compare Packet Switching and Circuit Switching.
Technical
Q81Differentiate between synchronous and asynchronous transmission.
Technical
Q82What are MTU and Path MTU Discovery (PMTUD)?
Technical
Q83Why is Manchester encoding called self-clocking? Compare it with NRZ.
Technical
Q84What is RTT (Round Trip Time)?
Technical
Q85What is propagation delay and transmission delay? How do they affect network latency?
Technical
Q86Why Is UDP Preferred for Streaming and Online Gaming Despite Being Unreliable?
Technical
Q87Differentiate between Bluetooth, Wi-Fi, and ZigBee.
Technical
Q88What are Symmetric and Asymmetric Encryption?
Technical
Q89What is a firewall?
Technical
Q90What are the Advantages of Fiber Optics?
Technical
Q91Can IP Multicast Be Load-Balanced?
Technical
Q92What is a LAN?
Technical
Q93What is a hub?
Technical
Q94What are switches?
Technical
Q95What is data encapsulation?
Technical
Q96Describe network topology.
Technical
Q97What is a VPN?
Technical
Q98What is NAT?
Technical
Q99What is WAN?
Technical
Q100What is the OSI Physical Layer?
Technical
Q101What is a proxy server?
Technical
Q102What is the spine network?
Technical
Q103What is a hub-to-hub connection?
Technical
Q104What is anonymous FTP?
Technical
Q105What is a subnet mask?
Technical
Q106What is the maximum length allowed in a UTP cable?
Technical
Q107How does network topology affect network setup?
Technical
Q108What is RIP?
Technical
Q109What is the importance of carrying out a Fault Tolerance System?
Technical
Q110What does 10Base-T mean?
Technical
Q111How would you handle a network using a router?
Situational
Q112Define the OSI model?
Technical
Q113How are tunnels used in networking?
Technical
Q114Explain the significance of Encryption on a network.
Technical
Q115What is multicast routing?
Technical
Q116What is a private IP address?
Technical
Q117What is the OSI Session Layer?
Technical
Q118What are proxy servers, and how do they protect computer networks?
Technical
Q119What is sneakernet?
Technical
Q120What protocols fall under TCP/IP internet layer?
Technical
Q121What is one fundamental requirement for establishing VLANs?
Technical
Q122How do you secure a network against DDoS attacks?
Situational
Q123Explain the difference between network address translation (NAT) and port address translation (PAT).
Technical
Q124How does utilizing a network monitoring system (NMS) benefit you?
Technical
Q125What is the purpose of Border Gateway Protocol (BGP)?
Technical
Q126Explain the concept of Quality of Service (QoS) and how it works.
Technical
Q127What are some common causes of network congestion?
Technical
Q128What is the difference between IPv4 and IPv6?
Technical
Q129What are some best practices for wireless network security?
Technical
Q130Explain the differences between TCP and UDP protocols.
Technical
Q131What is subnetting, and why is it important?
Technical
Q132Describe the function of ARP.
Technical
Q133What is a MAC address? How is it different from an IP address?
Technical
Q134What’s the difference between static and dynamic routing?
Technical
Q135How is EIGRP different from other routing protocols?
Technical
Q136How does a switch operate at Layer 2 of the OSI model?
Technical
Q137What’s the function of STP?
Technical
Q138How does link aggregation improve network performance?
Technical
Q139Explain the difference between a stateful and a stateless firewall.
Technical
Q140How does a VPN work? In what cases is it useful?
Technical
Q141What’s the purpose of network segmentation?
Technical
Q142How does intrusion detection and prevention work?
Technical
Q143How do you implement and manage access control lists (ACLs)?
Technical
Q144How do you design a scalable network?
Technical
Q145What is a three-tier network architecture?
Technical
Q146How do you ensure high availability in a network?
Technical
Q147Explain the difference between 2.4 GHz and 5 GHz Wi-Fi frequencies.
Technical
Q148What is SSID? Why is it important?
Technical
Q149What are wireless network channels? What’s their purpose?
Technical
Q150What is a mesh network? How does it work?
Technical
Q151What network management software do you typically use? What key features are most important to you?
Technical
Q152Explain the role of NetFlow in network monitoring.
Technical
Q153What is a network baseline? Why is it important?
Technical
Q154Describe how to set up alerts for network issues.
Technical
Q155How do you analyze network traffic patterns?
Technical
Q156What scripting languages have you used for network automation?
Technical
Q157How do you use Bash in network administration?
Technical
Q158How do you automate configuration management for network devices?
Technical
Q159Describe a situation where you used a script to solve a network issue.
Experience
Q160How do you integrate scripts with network monitoring tools?
Technical
Q161What is the administrative distance of OSPF?
Technical
Q162What port does BGP use?
Technical
Q163What does DHCP option 150 do?
Technical
Q164What do 2,000 to 3,000 users need from the network?
Motivational
Q165What tools do you use for troubleshooting?
Technical
Q166What are some basic ways to speed up network performance?
Technical
Q167What things should you consider when you work with several departments and large infrastructures?
Situational
Q168How can you discover network topology?
Technical
Q169How do you find answers to problems you can't solve?
Behavioral
Q170A gateway works in which layer of the OSI model?
Technical
Q171How many layers are there in the OSI reference model? Name them.
Technical
Q172What is the difference between forward and reverse lookup?
Technical
Q173What is a backbone network?
Technical
Q174What is a network and how does data move across it?
Technical
Q175Difference between TCP and UDP — when do you use each?
Technical
Q176Walk me through what happens when you type google.com in a browser.
Technical
Q177Explain DHCP — what happens when a new device joins a network?
Technical
Q178Explain the OSI model — and which layers do TCP and IP operate at?
Technical
Q179What's the broadcast address and number of usable hosts for 192.168.1.0/26?
Technical
Q180How do you subnet 10.0.0.0/16 to support 50 subnets each with at least 100 hosts?
Technical
Q181Difference between access port and trunk port?
Technical
Q182What's the role of Spanning Tree Protocol (STP) and how is the root bridge elected?
Technical
Q183What's the difference between RSTP and traditional STP?
Technical
Q184What's the difference between OSPF, EIGRP, and BGP?
Technical
Q185Explain OSPF area types — backbone, regular, stub, totally stubby, NSSA.
Technical
Q186What's an OSPF DR/BDR and why are they elected?
Technical
Q187EIGRP DUAL algorithm — explain Successor and Feasible Successor.
Technical
Q188BGP path attributes — list the 6 well-known mandatory ones.
Technical
Q189Standard vs extended ACL — when do you use each?
Technical
Q190Difference between NAT, PAT, and dynamic NAT?
Technical
Q191Site-to-site IPsec VPN — explain Phase 1 and Phase 2.
Technical
Q192EtherChannel — LACP vs PAgP vs static. Trade-offs?
Technical
Q193What are the differences between 802.11ax (Wi-Fi 6) and 802.11ac (Wi-Fi 5)?
Technical
Q194User reports they can't reach 8.8.8.8 from their PC — walk through troubleshooting.
Situational
Q195show ip ospf neighbor returns 'EXCHANGE' state stuck — what's wrong?
Situational
Q196BGP neighbor stuck in 'Active' state — what does it mean?
Situational
Q197What is Netmiko and how does it differ from Paramiko?
Technical
Q198Show me a basic Ansible playbook to push a config to 10 Cisco switches.
Technical
Q199What is SD-WAN and how does it differ from MPLS?
Technical
Q200Explain Zero Trust Network Architecture (ZTNA) and how it differs from VPN.
Technical
Q201What is BGP EVPN and where is it used?
Technical
Q202Explain AWS VPC peering vs Transit Gateway — when to use each?
Technical
Q203What's the difference between AWS Network Load Balancer (NLB) and Application Load Balancer (ALB)?
Technical
Q204Difference between IPS, IDS, and a firewall?
Technical
Q205What is 802.1X and how does it integrate with NAC?
Technical
Q206Tell me about a time you broke something in production. What happened, and how did you fix it?
Behavioral
Q207Why are you switching from your current job?
Motivational
Q208What is HA1 and HA2 in Palo Alto high availability configuration?
Technical
Q209What constitutes the 6-tuple for session matching in Palo Alto Networks firewalls?
Technical
Q210What is MP-BGP and how does it differ from regular BGP-4?
Technical
Q211What is the difference between OSPF and EIGRP, and when would you choose each in 2026?
Technical
Q212Explain MP-BGP address families and their use cases (VPNv4, EVPN, IPv6, multicast).
Technical
Q213What is VRRP and how does it differ from HSRP and GLBP for first-hop redundancy?
Technical
Q214What is L1, L2, L3 in network engineer support tiers and how do responsibilities differ?
Experience
Q215What questions does Cisco India ask in a network engineer technical interview?
Other
Q216Explain how a Palo Alto Security Policy is evaluated — top-down rule processing.
Technical
Q217What is the 30-60-90 day plan question in an interview, and how should a network engineer answer it?
Other