LFCE Advanced Linux Networking Quiz

1. Which file stores the hostname configuration on most Linux systems?

/etc/networks

/etc/hostname

/etc/sysconfig/network

/etc/host.conf

2. What is the purpose of VLAN (Virtual LAN) tagging in enterprise networks?

Encrypt network traffic

Segment networks logically on shared physical infrastructure

Increase bandwidth capacity

Improve DNS resolution speed

3. Which protocol operates at Layer 4 (Transport Layer) and provides ordered delivery?

UDP

TCP

ICMP

IGMP

4. What is the main advantage of using 'firewalld' over 'iptables' on modern Linux systems?

Better performance

Dynamic firewall management with zones and services

Lower memory usage

Simpler syntax

5. Which iptables rule target ACCEPTS packets matching the rule criteria?

DROP

REJECT

ACCEPT

DENY

6. What is the purpose of the ARP (Address Resolution Protocol) in networking?

Resolve domain names to IP addresses

Map IP addresses to MAC addresses on local networks

Route packets between networks

Encrypt network traffic

7. In Linux routing, which command displays the kernel routing table?

Route -n or ip route show

Netstat -rn

Arp -r

Ip table list

8. What does the 'ss' command provide that 'netstat' also provides?

Socket statistics and network connection information

System security audit logs

SSH connection details

Service status reports

9. Which utility is used to configure and manage network bridges in Linux?

Brctl

Vconfig

Ethtool

Tc

10. What is the purpose of the /etc/resolv.conf file?

Configure IP routing tables

Specify DNS nameserver addresses

Define firewall rules

Store ARP cache entries

11. Which command displays all active network connections and listening ports on a Linux system?

Netstat -tuln

Ifconfig -a

Route -n

Arp -a

12. What does NAT (Network Address Translation) allow on a Linux router?

Multiple internal networks to share a single public IP address

Automatic DNS resolution without a server

Encryption of all network traffic

Simultaneous connections on multiple interfaces

13. In iptables, which chain is used for filtering incoming traffic to the local system?

OUTPUT

FORWARD

INPUT

PREROUTING

14. Which command is used to trace the route packets take to reach a destination host?

Ping

Traceroute

Nslookup

Whois

15. What is the default DNS port number used for queries?

25

53

110

443

16. Which protocol is used for dynamic IP address assignment on networks?

DNS

DHCP

ARP

ICMP

17. What does CIDR notation represent in network addressing?

Classless Inter-Domain Routing subnet mask format

Centralized Internet Domain Registry

Cyclic Inter-Datagram Routing protocol

Custom IP Designation and Reservation

18. Which file configures static IP addresses and network interfaces on RHEL/CentOS systems?

/etc/network/interfaces

/etc/sysconfig/network-scripts/ifcfg-*

/etc/resolv.conf

/etc/hosts

19. In the OSI model, which layer is responsible for IP addressing and routing?

Data Link Layer (Layer 2)

Network Layer (Layer 3)

Transport Layer (Layer 4)

Application Layer (Layer 7)

20. What is the primary purpose of the iptables utility in Linux networking?

Configure network interfaces

Manage firewall rules and packet filtering

Display routing tables

Monitor bandwidth usage