The most significant security vulnerability is that the pre-shared key is applied to all potential peers due to the wildcard address. In this configuration, the ISAKMP policy uses a wildcard peer address of 0.0.0.0 0.0.0.0, which means any device can attempt to authenticate using that single pre-shared key, effectively turning it into a shared secret across all possible peers and drastically increasing the risk of unauthorized VPN connections. On the Systems Security Certified Practitioner SSCP exam, this scenario tests your understanding of IPsec pre-shared key wildcard vulnerability and how improper peer specification undermines authentication integrity—a common trap is confusing a strong PSK with a properly scoped peer address. Remember the mnemonic “Wildcard PSK = Welcome mat for attackers” to recall that a wildcard peer negates the security of any pre-shared key.
SSCP Network and Communications Security Practice Question
This SSCP practice question tests your understanding of network and communications security. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Exhibit
Refer to the exhibit.
crypto isakmp policy 10
authentication pre-share
encryption aes 256
hash sha
group 14
lifetime 3600
crypto isakmp key cisco123 address 0.0.0.0 0.0.0.0
Refer to the exhibit. A network administrator is reviewing the VPN configuration on a site-to-site VPN hub. Which of the following is the most significant security vulnerability in this configuration?
Refer to the exhibit.
crypto isakmp policy 10
authentication pre-share
encryption aes 256
hash sha
group 14
lifetime 3600
crypto isakmp key cisco123 address 0.0.0.0 0.0.0.0
A
The encryption algorithm AES-256 is too weak
Why wrong: AES-256 is a strong encryption algorithm and is considered secure for VPNs. This is not a vulnerability.
B
The pre-shared key is applied to all potential peers due to the wildcard address
The wildcard peer address (0.0.0.0 0.0.0.0) means the key is shared with any device, making it a shared secret across all peers. This greatly increases the risk of unauthorized access.
C
The hash algorithm SHA is insecure
Why wrong: SHA (Secure Hash Algorithm) is a family of secure cryptographic hash functions. The specific version (SHA-1 or SHA-2) is not specified, but SHA in general is considered secure for IKE. The vulnerability is not in the hash algorithm.
D
The pre-shared key is too short and easily guessable
Why wrong: While 'cisco123' is weak, the more critical issue is the wildcard peer address, which exposes the key to any entity. A strong key alone would not mitigate this exposure.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The pre-shared key is applied to all potential peers due to the wildcard address
The ISAKMP key is configured with a wildcard peer address (0.0.0.0 0.0.0.0), meaning any device can attempt to authenticate using this pre-shared key. This effectively makes the key a shared secret across all potential peers, greatly increasing the risk of unauthorized VPN connections and reducing the security of the authentication mechanism. The use of pre-shared keys is acceptable in controlled environments, but the wildcard peer setting is the critical flaw.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 encryption algorithm AES-256 is too weak
Why it's wrong here
AES-256 is a strong encryption algorithm and is considered secure for VPNs. This is not a vulnerability.
✓
The pre-shared key is applied to all potential peers due to the wildcard address
Why this is correct
The wildcard peer address (0.0.0.0 0.0.0.0) means the key is shared with any device, making it a shared secret across all peers. This greatly increases the risk of unauthorized access.
Related concept
Read the scenario before looking for a memorised answer.
✗
The hash algorithm SHA is insecure
Why it's wrong here
SHA (Secure Hash Algorithm) is a family of secure cryptographic hash functions. The specific version (SHA-1 or SHA-2) is not specified, but SHA in general is considered secure for IKE. The vulnerability is not in the hash algorithm.
✗
The pre-shared key is too short and easily guessable
Why it's wrong here
While 'cisco123' is weak, the more critical issue is the wildcard peer address, which exposes the key to any entity. A strong key alone would not mitigate this exposure.
Common exam traps
Common exam trap: answer the scenario, not the keyword
Many certification questions include familiar terms but test a specific constraint. Read the exact wording before choosing an answer that is generally true but wrong for this case.
Detailed technical explanation
How to think about this question
This question should be treated as a scenario, not a definition check. Identify the problem, the constraint and the best action. Then compare each option against those facts.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
Use explanations to understand the rule behind the answer.
TExam Day Tips
→Underline the problem statement mentally.
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A developer is choosing between AES-256 (symmetric) and RSA-2048 (asymmetric) for encrypting a large file that will be sent to a partner. Symmetric encryption is fast but requires key exchange; asymmetric is slower but solves the key distribution problem. A hybrid approach — encrypt the file with AES, encrypt the AES key with RSA — is standard. Questions like this test whether you understand when each approach applies.
What to study next
Got this wrong? Here's your next step.
Identify which SSCP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
Network and Communications Security — This question tests Network and Communications Security — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The pre-shared key is applied to all potential peers due to the wildcard address — The ISAKMP key is configured with a wildcard peer address (0.0.0.0 0.0.0.0), meaning any device can attempt to authenticate using this pre-shared key. This effectively makes the key a shared secret across all potential peers, greatly increasing the risk of unauthorized VPN connections and reducing the security of the authentication mechanism. The use of pre-shared keys is acceptable in controlled environments, but the wildcard peer setting is the critical flaw.
What should I do if I get this SSCP question wrong?
Identify which SSCP exam domain this question belongs to, then review the specific concept being tested. Practise related questions in that domain and focus on understanding why each wrong answer is tempting — not just why the correct answer is right.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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