Ports & Protocols interview questions

1. A.the well-known port for LDAP secured with TLS
2. B.the legacy protocol that maps a MAC address to an IP address
3. C.the protocol for monitoring and managing network devices, typically on port 161
4. D.the well-known port for encrypted remote shell access

Answer + AI explanation with Pro

1. A.NTP
2. B.ARP
3. C.port 23 → Telnet
4. D.port 22 → SSH

Answer + AI explanation with Pro

1. A.port 22 → SSH — the well-known port for sending email between mail servers
2. B.port 22 → SSH — the protocol for monitoring and managing network devices, typically on port 161
3. C.port 22 → SSH — the well-known port for encrypted remote shell access
4. D.port 22 → SSH — the well-known control port for the File Transfer Protocol

Answer + AI explanation with Pro

1. A.the well-known port for sending email between mail servers
2. B.the protocol that synchronizes clocks across networked devices on port 123
3. C.a UDP-based transport underpinning HTTP/3 with built-in encryption and multiplexing
4. D.a protocol that encapsulates arbitrary Layer 3 packets inside IP for tunneling

Answer + AI explanation with Pro

1. A.port 25 → SMTP
2. B.NTP
3. C.port 161 → SNMP
4. D.port 636 → LDAPS

Answer + AI explanation with Pro

1. A.port 25 → SMTP — the well-known port for LDAP secured with TLS
2. B.port 25 → SMTP — the well-known port for sending email between mail servers
3. C.port 25 → SMTP — a common non-privileged port for proxies and dev web servers
4. D.port 25 → SMTP — the well-known port for SNMP polling of devices

Answer + AI explanation with Pro

1. A.the legacy protocol that maps a MAC address to an IP address
2. B.the well-known port for retrieving email while leaving it on the server
3. C.the well-known port for encrypted remote shell access
4. D.the well-known control port for the File Transfer Protocol

Answer + AI explanation with Pro

1. A.NTP
2. B.QUIC
3. C.RARP
4. D.port 21 → FTP

Answer + AI explanation with Pro

1. A.port 21 → FTP — the well-known port for encrypted remote shell access
2. B.port 21 → FTP — the well-known control port for the File Transfer Protocol
3. C.port 21 → FTP — the protocol that synchronizes clocks across networked devices on port 123
4. D.port 21 → FTP — a common non-privileged port for proxies and dev web servers

Answer + AI explanation with Pro

1. A.the protocol for monitoring and managing network devices, typically on port 161
2. B.the well-known port for unencrypted remote terminal access
3. C.the well-known port for sending email between mail servers
4. D.a common non-privileged port for proxies and dev web servers

Answer + AI explanation with Pro

1. A.port 143 → IMAP
2. B.port 389 → LDAP
3. C.port 23 → Telnet
4. D.port 22 → SSH

Answer + AI explanation with Pro

1. A.port 23 → Telnet — the well-known port for sending email between mail servers
2. B.port 23 → Telnet — the well-known port for unencrypted remote terminal access
3. C.port 23 → Telnet — the well-known port for encrypted remote shell access
4. D.port 23 → Telnet — the protocol for monitoring and managing network devices, typically on port 161

Answer + AI explanation with Pro

1. A.the well-known control port for the File Transfer Protocol
2. B.the well-known port for Microsoft Remote Desktop Protocol
3. C.the well-known port for unencrypted remote terminal access
4. D.the well-known port for encrypted remote shell access

Answer + AI explanation with Pro

1. A.SNMP
2. B.port 161 → SNMP
3. C.port 3389 → RDP
4. D.port 21 → FTP

Answer + AI explanation with Pro

1. A.port 3389 → RDP — the protocol for monitoring and managing network devices, typically on port 161
2. B.port 3389 → RDP — the protocol used for error messages and diagnostics such as ping
3. C.port 3389 → RDP — the well-known port for retrieving email while leaving it on the server
4. D.port 3389 → RDP — the well-known port for Microsoft Remote Desktop Protocol

Answer + AI explanation with Pro

1. A.the well-known port for SNMP polling of devices
2. B.the well-known port for unencrypted remote terminal access
3. C.a protocol that encapsulates arbitrary Layer 3 packets inside IP for tunneling
4. D.the protocol that resolves an IPv4 address to a MAC address on a local link

Answer + AI explanation with Pro

1. A.QUIC
2. B.ICMP
3. C.ARP
4. D.port 143 → IMAP

Answer + AI explanation with Pro

1. A.ARP — the protocol for monitoring and managing network devices, typically on port 161
2. B.ARP — the well-known port for retrieving email while leaving it on the server
3. C.ARP — the legacy protocol that maps a MAC address to an IP address
4. D.ARP — the protocol that resolves an IPv4 address to a MAC address on a local link

Answer + AI explanation with Pro

1. A.the well-known port for retrieving email while leaving it on the server
2. B.the protocol used for error messages and diagnostics such as ping
3. C.the well-known port for LDAP secured with TLS
4. D.the protocol for monitoring and managing network devices, typically on port 161

Answer + AI explanation with Pro

1. A.port 161 → SNMP
2. B.ICMP
3. C.port 143 → IMAP
4. D.port 23 → Telnet

Answer + AI explanation with Pro

1. A.ICMP — the well-known port for Microsoft Remote Desktop Protocol
2. B.ICMP — a UDP-based transport underpinning HTTP/3 with built-in encryption and multiplexing
3. C.ICMP — the well-known port for retrieving email while leaving it on the server
4. D.ICMP — the protocol used for error messages and diagnostics such as ping

Answer + AI explanation with Pro

1. A.a protocol that encapsulates arbitrary Layer 3 packets inside IP for tunneling
2. B.the protocol that synchronizes clocks across networked devices on port 123
3. C.the protocol for monitoring and managing network devices, typically on port 161
4. D.the well-known port for SNMP polling of devices

Answer + AI explanation with Pro

1. A.port 143 → IMAP
2. B.port 389 → LDAP
3. C.NTP
4. D.SNMP

Answer + AI explanation with Pro

1. A.SNMP — the well-known ports DHCP servers and clients use
2. B.SNMP — a UDP-based transport underpinning HTTP/3 with built-in encryption and multiplexing
3. C.SNMP — the protocol for monitoring and managing network devices, typically on port 161
4. D.SNMP — the well-known port for LDAP secured with TLS

Answer + AI explanation with Pro

1. A.the well-known port for directory service lookups
2. B.the protocol for monitoring and managing network devices, typically on port 161
3. C.the well-known port for unencrypted remote terminal access
4. D.the protocol that synchronizes clocks across networked devices on port 123

Answer + AI explanation with Pro

1. A.port 143 → IMAP
2. B.NTP
3. C.ICMP
4. D.port 161 → SNMP

Answer + AI explanation with Pro

1. A.NTP — the protocol used for error messages and diagnostics such as ping
2. B.NTP — the protocol that resolves an IPv4 address to a MAC address on a local link
3. C.NTP — a protocol that encapsulates arbitrary Layer 3 packets inside IP for tunneling
4. D.NTP — the protocol that synchronizes clocks across networked devices on port 123

Answer + AI explanation with Pro

1. A.the well-known port for sending email between mail servers
2. B.the well-known port for retrieving email while leaving it on the server
3. C.the well-known control port for the File Transfer Protocol
4. D.the well-known port for LDAP secured with TLS

Answer + AI explanation with Pro

1. A.port 8080 → HTTP alternate
2. B.QUIC
3. C.port 143 → IMAP
4. D.ICMP

Answer + AI explanation with Pro

1. A.port 143 → IMAP — the well-known port for retrieving email while leaving it on the server
2. B.port 143 → IMAP — the well-known port for sending email between mail servers
3. C.port 143 → IMAP — the legacy protocol that maps a MAC address to an IP address
4. D.port 143 → IMAP — the protocol used for error messages and diagnostics such as ping

Answer + AI explanation with Pro