Telnet is an application layer protocol used to establish a connection with a remote system, usually a server. It is used for interactive text–based communication between two computers over the Internet or local network. Telnet commands are used to control and manage the remote computer. Examples of Telnet commands include logging in and out of a session, changing directories, sending commands, transferring files, and more.

1. Monitor network traffic: Monitor the amount of traffic that is present on your network to detect abnormal activity. Unusual or excessive network traffic could be an indication of a sniffer.

2. Investigate suspicious IP addresses: Investigate any unfamiliar IP addresses that appear in log files and system processes.

3. Look for unusual port scans: Check your firewall logs for any suspicious port scans that are being performed. A port scan could be used to find vulnerable services that can be exploited with a sniffer.

4. Enable antivirus software: Install and enable antivirus software on all computers connected to the network. The virus scanner should detect any known malicious software, including sniffers.

5. Use network monitoring tools: Utilize network monitoring tools such as Wireshark to examine network traffic and detect any suspicious network activity.

6. Scan for open ports: Scan for open ports on each computer connected to the network to ensure that no unauthorized devices are connected.

The key difference between ARP and RARP is that, while ARP is used to translate IP addresses into MAC addresses, RARP is used to translate MAC Addresses into IP addresses. ARP (Address Resolution Protocol) is a protocol used by hosts to map physical addresses of hosts to their corresponding logical addresses when sending data over a network. RARP (Reverse Address Resolution Protocol) is a network protocol used by a computer of a local area network for the purpose of obtaining its own IP address from another computer on the same network.

Virtual machines (VMs) are a type of software technology used in cloud computing to enable organizations to access computing resources on demand. VMs are created through the process of virtualization and allow companies to replicate or abstract computing hardware, operating systems, and applications within a private cloud or other distributed computing environment. Through the use of virtualization, a single physical server or computer can be transformed into multiple separate virtual machines and shared across multiple users. This allows for organizations to scale their operations quickly and efficiently as well as run and manage multiple applications and services concurrently.

There could be a few different reasons why your Mac Air is randomly shutting down. The most likely causes include a failing battery, faulty power supply, or software issues. You should first try resetting the System Management Controller (SMC) on your Mac, as this can sometimes solve the problem. If that doesn‘t work, try using Apple Diagnostics or Apple Hardware Test to determine if the issue is related to hardware. If the problem persists, you may need to take your Mac Air to an authorized repair centre to have it professionally serviced.