Objective 5.5

200-301

Describe IPsec remote access and site-to-site VPNs.

Objective 5.5 sits in Security Fundamentals, which carries 15% of the CCNA exam. The questions below are original, written from the official objective title above, and each explanation cites the Cisco page it rests on.

Objective title verbatim from the official objectives. Cisco exam page ↗

A worked example

Shown solved, with the whole explanation open: this is what every question here carries.

5-5Security Fundamentals

A LAN to LAN IPsec tunnel between two ASAs is up, and you are tracing which ISAKMP exchange carries which protection. What does each phase build?

Phase 1 protects data, phase 2 rekeys the first tunnelReversed. User data rides in the phase 2 association, and the phase 1 tunnel is rebuilt on its own lifetime rather than rekeyed by phase 2.
Both phases carry user data over separate transform setsOnly one of the two carries user traffic. A transform set describes the phase 2 protection, and both peers must hold the same one.
Phase 1 selects the ACL, phase 2 selects the peerThe crypto ACL and the peer address are crypto map settings, entered before either exchange runs.
Phase 1 protects later negotiation, phase 2 protects dataCorrect · your answerCorrect. Negotiation first, then the data tunnel.

Correct.

Checked against cisco.com, August 2026

Concept

IPsec comes up in two stages so that the bargaining itself is not exposed. The first stage builds a protected channel for the exchange, and only inside that cover does the pair settle the keys that will carry production traffic.

Why D

The first tunnel exists to shield the ISAKMP messages that follow it. The second exchange negotiates the IPsec security association under that shield, and it is the association user traffic actually rides.

Source

ISAKMP separates negotiation into two phases: Phase 1 and Phase 2. Phase 1 creates the first tunnel, which protects later ISAKMP negotiation messages. Phase 2 creates the tunnel that protects data.

Cisco ASA Series VPN CLI Configuration Guide 9.17: LAN-to-LAN IPsec VPNs, checked August 2026
#ipsec#isakmp#site-to-site-vpn

Now you: objective 5.5 questions

No account needed. The explanation opens when you answer.

Sample question 1 of 3

5-5Security Fundamentals

Remote clients finish IKE phase 1 with the ASA, but no IPsec security association forms and no data passes. Which condition produces that result?

Sample question 2 of 3

5-5Security FundamentalsChoose 2

A company links two offices with an IPsec tunnel using ESP and must record what the tunnel protects. Which two services does ESP provide? (Choose two.)

Sample question 3 of 3

5-5Security Fundamentals

A site-to-site tunnel must protect IP traffic between two offices. Which architecture document defines the elements of such a system?

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Read the sources

These are the official pages the questions above cite. Reading them is studying the objective from the primary source, which is what the explanations point you toward anyway.

More objectives in Security Fundamentals