15 to 30 random questions in 15 to 30 minutes, by the level you choose: osi, subnetting, routing, tcp/udp, congestion, dns, security, delays. After you submit you get your score, your strong and weak topics, and the right answer with an explanation for every question.
Want to revise first? Read the Computer Networks interview questions and answers.
The test covers 12 topics across three levels. Each attempt picks 15 to 30 questions at random, by the level you choose, so every attempt is different.
One question from each level, the way they appear in the test. A new set comes on the 1st of every month. Try it, then open the answer.
Answer: ff:ff:ff:ff:ff:ff. All 48 bits set to 1 means every station on the LAN must accept the frame; ARP requests use it. 01:00:5e:00:00:01 is a multicast address (for the IPv4 all-hosts group), and all zeros is not a valid destination.
Answer: It forwards frames without reading IPs; an IP on a managed switch is only for managing it. Layer 2 forwarding uses only MAC addresses in the frame header. A managed switch may have one IP address on a management VLAN so admins can reach it over SSH or SNMP, but that address plays no part in forwarding.
Answer: 1428 bytes. The IPv6 base header is a fixed 40 bytes, and the TCP header is 20 bytes plus the 12-byte padded timestamps option, so 1500 - 40 - 32 = 1,428 bytes. 1,448 is the same case over IPv4, whose base header is only 20 bytes.
Take the full Computer Networks mock test: 15 to 30 questions and 15 to 30 minutes, by level.
A question counts as right only when you pick exactly the right option, or all the right options where it says so; a question left blank counts as wrong. Your score is the share of the test's questions you got right (15 to 30, by level). The result also scores every topic, so you know what to revise before the interview.
Yes. The Computer Networks mock test is free. You need a free CoreHRx Jobs account to start it, so your score and the topics to work on are saved.
It depends on the level: Easy has 15 questions in 15 minutes, Medium has 20 questions in 20 minutes, Hard has 30 questions in 30 minutes. They are multiple-choice questions picked at random from a larger bank of Computer Networks questions at your level, so every attempt is different.
The questions cover Data Link Layer and Ethernet, Delays and Throughput, DNS, DHCP and HTTP, Email and Other Application Protocols, Error Detection and Correction, Flow and Congestion Control, IP Addressing and Subnetting, Network Devices, Network Security, OSI and TCP/IP Models, Routing, TCP and UDP. Your result shows how you did in each topic.
Easy: OSI and TCP/IP layers, devices, common protocols and ports. Medium: Subnetting, TCP vs UDP, routing, DNS and error control. Hard: Congestion control, sliding windows, delays and tricky subnetting. Start with Easy and move up.
Only your best Computer Networks score, and only when it is 60% or more. It shows on the job applications you send on CoreHRx. Lower scores stay private.
Yes, up to 10 tests a day. Each attempt picks questions you have not seen recently first.
