Question 1hardmultiple choice
Full question →hardmultiple choiceObjective-mapped
A vendor distributes a Linux package through multiple mirrors. Security wants to verify that the package really came from the vendor and was not altered after publication, even if a mirror or CDN is compromised. Which cryptographic mechanism should be checked?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Distractor review
A hash value published on the mirror site alone
A hash can detect tampering only if the hash itself is obtained from a trusted source. A compromised mirror could change both the file and the hash.
B
Best answer
A digital signature created with the vendor's private key
A digital signature provides authenticity and integrity. If the package was signed with the vendor's private key, anyone with the matching public certificate can verify that the package came from the vendor and has not been altered since signing. This works even if the download is mirrored or relayed by an untrusted CDN, because verification does not depend on trusting the transport path.
C
Distractor review
Symmetric encryption of the package with a shared secret
Symmetric encryption protects confidentiality, but it does not by itself prove who created the package or whether it was modified.
D
Distractor review
Key stretching with a slow password algorithm
Key stretching is used to make password guessing harder, not to verify software origin or file integrity.
Common exam trap
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Technical deep dive
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
- Static NAT maps one inside address to one outside address.
- PAT allows many inside hosts to share one public address using ports.
- Inside local and inside global describe the private and translated addresses.
- NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
- Identify inside and outside interfaces first.
- Check whether the scenario needs static NAT, dynamic NAT or PAT.
- Do not confuse NAT matching ACLs with normal packet-filtering intent.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A laptop is suspected of being used in a malware incident. It is still powered on and connected to Wi-Fi. What should the responder do before shutting it down?
Question 2
An employee reports a ransomware note on a file server. The server is still powered on, shares are still being accessed, and management wants service restored as quickly as possible. What should the incident response team do first?
Question 3
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Question 4
You are handed a company laptop suspected in an insider theft case. Legal says the evidence may be needed in court. Which action best preserves admissibility?
Question 5
A developer wants to reduce the risk of SQL injection in a new customer search form. Which two changes are the best mitigations? Select two.
Question 6
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FAQ
Questions learners often ask
What does this SY0-701 question test?
Static NAT maps one inside address to one outside address.
What is the correct answer to this question?
The correct answer is: A digital signature created with the vendor's private key — A digital signature provides authenticity and integrity. If the package was signed with the vendor's private key, anyone with the matching public certificate can verify that the package came from the vendor and has not been altered since signing. This works even if the download is mirrored or relayed by an untrusted CDN, because verification does not depend on trusting the transport path. Why others are wrong: A hash from the mirror alone is not trustworthy if the mirror is compromised. Symmetric encryption protects confidentiality, but it does not prove source or integrity. Key stretching is for password resistance and has nothing to do with package verification. The scenario is specifically about verifying origin and tamper resistance from an untrusted distribution path.
What should I do if I get this SY0-701 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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