SAC Networking and Security Fundamentals 1 — Questions and Answers
Question 1: Which IP address class is typically used for large networks?
- Class C
- Class B
- Class A (Correct answer)
- Class D
Correct answer: Class A
Class A IP addresses are designed for very large networks, characterized by their first octet ranging from 1-126. This class allocates the first octet for the network ID and the remaining three octets for host IDs. This structure allows for over 16 million hosts per network, making it suitable for organizations requiring extensive host addressing.
Question 2: Which protocol is used to assign IP addresses automatically?
- DNS
- FTP
- DHCP (Correct answer)
- HTTP
Correct answer: DHCP
DHCP (Dynamic Host Configuration Protocol) is a network protocol that automatically assigns IP addresses and other network configuration parameters to devices on a network. This automation simplifies network administration by eliminating the need for manual IP configuration for each device. It ensures efficient and error-free IP address management.
Question 3: Which command can be used to test connectivity to a remote server?
- ipconfig
- ping (Correct answer)
- nslookup
- netstat
Correct answer: ping
The `ping` command is a fundamental network utility used to test the reachability of a host on an Internet Protocol (IP) network. It sends ICMP echo request packets to the target and listens for replies, measuring the round-trip time and indicating whether the host is alive and responding. This helps diagnose network connectivity issues.
Question 4: What is the purpose of a firewall?
- Improve wireless speed
- Assign MAC addresses
- Block unauthorized access (Correct answer)
- Manage domain names
Correct answer: Block unauthorized access
A firewall acts as a security barrier, monitoring and controlling incoming and outgoing network traffic based on predefined security rules. Its primary purpose is to block unauthorized access to a private network or computer system. This protection helps safeguard against various cyber threats and ensures data integrity and confidentiality.
Question 5: Which of the following is a secure method of remote server access?
- FTP
- Telnet
- SSH (Correct answer)
- SMTP
Correct answer: SSH
SSH (Secure Shell) is a cryptographic network protocol that allows secure remote access to computers over an unsecured network. It provides strong authentication and encrypts all communication between the client and server. This encryption protects against eavesdropping and other network attacks, making it the preferred method for remote administration.
Question 6: Which of the following is a common network port for HTTP traffic?
- 21
- 25
- 80 (Correct answer)
- 443
Correct answer: 80
Port 80 is the standard and well-known port number assigned to HTTP (Hypertext Transfer Protocol) traffic. Web browsers use this port by default to communicate with web servers when requesting web pages. It is essential for basic, unencrypted internet browsing.
SAC Networking and Security Fundamentals 1
Which IP address class is typically used for large networks?