What Top Companies Ask in Linux Ops & Cloud Engineer Interviews – Answers Inside

Job Position and Requirements

Position: Senior System Engineer (Application Operations)

Salary: 15K‑25K

Job Description

Build and maintain the company’s operations platform, including monitoring and maintenance of mobile apps, business systems, and a private cloud, while promoting automation.

Establish and improve monitoring and incident‑handling mechanisms to ensure stable business operation.

Collaborate with product development to deploy, test, tune, and operate applications and services, providing optimization suggestions.

Document operational procedures and consolidate experience.

Requirements

Bachelor’s degree or higher, ≥2 years of Linux operations experience in an internet company.

Proficient with Zabbix monitoring, custom script development.

Familiar with Nginx/Apache/Tomcat deployment and optimization.

Skilled in shell, Perl, and capable of developing simple tools with Python.

Experienced with automation tools such as Fabric, SaltStack.

Knowledge of network troubleshooting, iptables, VPN.

Virtualization or public‑cloud experience is a plus.

Interview Questions and Answers

1. Memory Types (SDRAM, DDR2, DDR3)

SDRAM (Synchronous Dynamic RAM) transfers data once per clock cycle on the rising edge. DDR (Double Data Rate) transfers twice per cycle (rising and falling edges). DDR2 doubles prefetch to 4 bits, allowing four times the external bus speed. DDR3 further increases prefetch to 8 bits, fixing the burst length at 8.

2. Which command cannot exit vi? :bye (the others are valid: :x, :q, :q!).

3. Protocols with both TCP and UDP

Telnet – TCP only

SMTP – TCP only

DNS – primarily UDP, but uses TCP for zone transfers and large responses.

4. Route selection among static, RIP, OSPF

Static routes have the lowest administrative distance (AD = 1) and are chosen over RIP (120), OSPF (110), etc.

5. Fill‑in Questions

SAN = Storage Area Network; NAS = Network Attached Storage.

Other Unix‑like systems: Solaris, FreeBSD, AIX.

Combine three files: cat file1.out file2.out file3.out > file4.out IP 192.168.48.10/255.255.255.128 → subnet 192.168.48.0, broadcast 192.168.48.127, host range 192.168.48.1‑192.168.48.126.

Check TCP connections: netstat.

OSI layer for HTTP: layer 7; switch operates at layer 1‑2.

Virtualization technologies: VMware, XEN, Bochs.

6. Short Answer Samples

32‑bit vs 64‑bit OS: 64‑bit supports larger address space (>4 GB), more memory, larger virtual memory, higher color depth; drawbacks include poorer backward compatibility and limited driver support.

SSD vs HDD: SSDs are shock‑resistant, silent, low‑heat, compact, fast; disadvantages are lower capacity and higher cost, with poorer data‑recovery options.

Multi‑core vs single‑core CPU: Multi‑core can double IPC when clock speed is unchanged, but not all programs benefit due to single‑thread limitations.

RAID configurations for six 150 GB disks: RAID 5 yields the largest usable capacity (150 GB × (6‑1) = 750 GB).

Web‑server performance troubleshooting steps: check hardware/system health, verify network latency and traffic, then examine web‑server load, configuration, and database connections.

7. Scenario Questions (no images provided)

ARP infection on host C affects ARP tables of A and B, potentially causing traffic disruption.

If B cannot reach server S while A and C can, the fault likely lies in B’s network stack or ARP cache.

Accessing server S from the Internet via router R4 requires NAT (or VPN) to translate public to private addresses.

8. Programming Tasks (outline)

Schedule a script to run every 5 minutes, log timestamped results, and at 23:56 aggregate the day’s results.

Process a file of "name score" lines to compute each person’s average and sort descending.

9. Logical Puzzle

A paradoxical statement creates a situation where the islanders cannot determine truthfulness, leaving the explorer’s fate undecided.

10. Discussion Topics

Unpredictable vs avoidable work situations and strategies to handle them.

Key qualities for a game operations engineer: proactive attitude, attention to pressure, broad knowledge and communication, calm mindset, integrity.