Network Security & Protocols Flashcards

Which protocol provides secure shell access for remote network device management and encrypts all session traffic?

Answer: SSH (Secure Shell)

SSH encrypts all data in transit, replacing the insecure Telnet protocol for remote device management.

A telecom operator needs to authenticate users before granting network access. Which 802.1X component issues or denies access credentials?

Answer: Authentication Server

In 802.1X, the Authentication Server (typically RADIUS) validates credentials and grants or denies access.

What type of attack floods a network with spoofed ICMP echo requests, overwhelming the victim with amplified response traffic?

Answer: Smurf attack

A Smurf attack sends spoofed ICMP requests to a broadcast address, causing all hosts to reply to the victim.

In IPsec, which mode encapsulates the entire original IP packet inside a new IP header, commonly used for VPN tunnels?

Answer: Tunnel mode

Tunnel mode encapsulates the entire original packet, making it suitable for site-to-site VPN connections.

Which cryptographic concept ensures that a sender cannot later deny having sent a message?

Answer: Non-repudiation

Non-repudiation, typically provided through digital signatures, prevents a sender from denying a transmitted message.

A network administrator wants to segment VoIP traffic from data traffic on the same physical switch. Which technology should be used?

Answer: VLANs (Virtual LANs)

VLANs logically separate network traffic at Layer 2, isolating VoIP from data traffic on shared switch infrastructure.

Which TLS handshake message is used by the server to prove its identity to the client during session establishment?

Answer: Certificate

The server sends its digital Certificate during the TLS handshake so the client can verify the server's identity.