Examkin

Soru

Zorluk: OrtaVirtual Private Networks and Remote Access Security

A network security administrator is deploying a site-to-site Virtual Private Network (VPN) using Internet Key Exchange version 2 (IKEv2) and IPsec. Place the following operational phases and message exchanges in the correct chronological order from the first step to the final step during successful tunnel negotiation and data transfer.

  1. 1The VPN peers exchange IKE_SA_INIT messages to negotiate cryptographic algorithms, exchange nonces, and perform a Diffie-Hellman key exchange.
  2. 2The VPN peers exchange encrypted IKE_AUTH messages to verify peer identities using certificates or pre-shared keys.
  3. 3The IPsec Child Security Association (Child SA) parameters are finalized to specify operational encryption and integrity algorithms for data payloads.
  4. 4User network traffic is encapsulated using Encapsulating Security Payload (ESP) and routed securely through the active IPsec tunnel.

Cevap

The correct chronological sequence for establishing an IKEv2/IPsec VPN tunnel is: 1) Negotiate cryptographic parameters and Diffie-Hellman keys via IKE_SA_INIT, 2) Authenticate peer identities via encrypted IKE_AUTH exchange, 3) Finalize the IPsec Child Security Association parameters, and 4) Transmit encapsulated payload data across the established tunnel.
IKEv2 establishes secure IPsec tunnels in a structured sequence: First, the IKE_SA_INIT exchange negotiates security algorithms and generates Diffie-Hellman key material. Second, using the encrypted channel formed by the initial exchange, the IKE_AUTH exchange authenticates peer identities (via certificates or pre-shared keys). Third, the specific IPsec Child Security Association parameters are negotiated. Finally, user network traffic is encapsulated using ESP and safely routed across the tunnel.

Adım Adım Çözüm

1
Identify the unauthenticated initial key exchange phase.
The IKE_SA_INIT message exchange establishes cryptographic suites and generates shared Diffie-Hellman secret material.
Encryption keys must be derived prior to authenticating sensitive identity credentials.
2
Identify the authentication phase.
The IKE_AUTH message exchange authenticates both endpoints securely over the encrypted channel established by IKE_SA_INIT.
Peer authentication prevents man-in-the-middle attacks before establishing data SAs.
3
Identify the Child SA negotiation phase.
The IPsec Child Security Association parameters are configured to secure actual user payload data.
The IKE SA manages control communications, while the Child SA manages protected data traffic.
4
Identify the active data transmission phase.
User traffic is encapsulated in ESP and transmitted across the tunnel.
Payload encryption can only take place after both control and data SAs are operational.

Anahtar Kavram

IKEv2/IPsec Tunnel Negotiation Sequence
Bu soruyu puanla

Konular

Virtual Private Networks and Remote Access Security

Bu konudan daha fazla soru