010-160 010-160 - LPI Linux Essentials Networking Basics Questions and Answers 1 — Questions and Answers
Question 1: Which command displays the IP address and network interface configuration on a Linux system?
- ip addr (Correct answer)
- ifconfig -a
- netstat -i
- route -n
Correct answer: ip addr
The `ip addr` command (from the iproute2 suite) shows all network interfaces and their assigned IP addresses on modern Linux systems.
Question 2: What command is used to test basic network connectivity by sending ICMP echo requests to a host?
- ping (Correct answer)
- traceroute
- netstat
- curl
Correct answer: ping
The `ping` command sends ICMP echo request packets to a target host and reports whether responses are received, testing basic network reachability.
Question 3: Which file on a Linux system maps hostnames to IP addresses locally without using DNS?
- /etc/hosts (Correct answer)
- /etc/hostname
- /etc/resolv.conf
- /etc/networks
Correct answer: /etc/hosts
The `/etc/hosts` file provides static hostname-to-IP mappings that are checked before DNS queries, allowing local name resolution overrides.
Question 4: What does the acronym DHCP stand for in Linux networking?
- Dynamic Host Configuration Protocol (Correct answer)
- Direct Host Control Protocol
- Distributed Host Connection Protocol
- Dynamic Hardware Configuration Program
Correct answer: Dynamic Host Configuration Protocol
DHCP (Dynamic Host Configuration Protocol) automatically assigns IP addresses, subnet masks, gateways, and DNS servers to network clients.
Question 5: Which file specifies the DNS nameserver(s) that a Linux system should use for hostname resolution?
- /etc/resolv.conf (Correct answer)
- /etc/hosts
- /etc/nsswitch.conf
- /etc/dns.conf
Correct answer: /etc/resolv.conf
The `/etc/resolv.conf` file contains the IP addresses of DNS nameservers (prefixed with `nameserver`) that the system consults for DNS lookups.
Question 6: What is the loopback IP address in IPv4 that always refers to the local machine?
- 127.0.0.1 (Correct answer)
- 192.168.0.1
- 0.0.0.0
- 255.255.255.255
Correct answer: 127.0.0.1
The IPv4 loopback address 127.0.0.1 (also known as localhost) always refers to the local machine and is used for testing network services locally.
010-160 010-160 - LPI Linux Essentials Networking Basics Questions and Answers 1
Which command displays the IP address and network interface configuration on a Linux system?