mediumMultiple ChoiceObjective-mapped
300-410 Practice Question: Runs the following command on Router R1: R1# show…
A network engineer runs the following command on Router R1:
R1# show crypto ipsec sa
interface: Tunnel0
Crypto map tag: VPN-MAP, local addr 10.1.1.1protected vrf: (none) local ident (addr/mask/prot/port): (10.1.1.0/255.255.255.0/0/0) remote ident (addr/mask/prot/port): (192.168.1.0/255.255.255.0/0/0) current_peer 10.1.1.2 port 500 PERMIT, flags={origin_is_acl,} #pkts encaps: 0, #pkts encrypt: 0, #pkts digest: 0 #pkts decaps: 0, #pkts decrypt: 0, #pkts verify: 0 #send errors 0, #recv errors 0
Based on this output, what is the problem?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The tunnel is up but no traffic is being encrypted; the crypto ACL may not match the traffic.
The IPsec SA is present but the packet counters are all zero. This indicates that the tunnel is established but no interesting traffic is being sent through it. The likely cause is that the crypto ACL does not match the actual traffic or routing is not directing traffic into the tunnel.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The IPsec SA is not established; phase 1 is still pending.
Why it's wrong here
The SA is present with a current peer; phase 1 and 2 are complete.
- ✓
The tunnel is up but no traffic is being encrypted; the crypto ACL may not match the traffic.
Why this is correct
Zero packet counts indicate no traffic has been encapsulated; check the crypto ACL and routing.
- ✗
The remote peer is unreachable; the SA is in a dead state.
Why it's wrong here
The SA is still present; if the peer were unreachable, the SA would be deleted or show errors.
- ✗
The tunnel interface is down; the SA cannot be used.
Why it's wrong here
The output does not show interface state; SA presence suggests tunnel is up.
Visual reference
Quick reference
VPN Protocol Comparison
| Protocol | Port | Encryption | Authentication | Use Case |
|---|---|---|---|---|
| IKEv2 / IPsec | UDP 500 / 4500 | AES-256 | Certificates / PSK | Site-to-site & remote access |
| SSL / TLS VPN | TCP 443 | TLS 1.3 | Certificates / MFA | Clientless remote access |
| L2TP / IPsec | UDP 1701 | AES (IPsec) | PSK / Certificates | Legacy remote access |
| WireGuard | UDP 51820 | ChaCha20 | Public keys | Modern high-performance VPN |
| PPTP | TCP 1723 | MPPE (weak) | MS-CHAPv2 | Legacy — avoid in production |
PPTP is considered insecure. IKEv2/IPsec and SSL VPN are the current recommended options.
Go deeper
Related to this question
Learn chapter
Introduction to ENARSI Exam and Network Fundamentals
Key term
MPLS Layer 3 VPN
A technology that uses Multiprotocol Label Switching to create secure, scalable virtual private networks that connect multiple sites at the network layer, where the service provider manages routing between customer sites.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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