Discuss ISC2 SSCP Exam Topic 6 Question 44

Which of the following rules appearing in an Internet firewall policy is inappropriate?

ASource routing shall be disabled on all firewalls and external routers.

BFirewalls shall be configured to transparently allow all outbound and inbound services.

CFirewalls should fail to a configuration that denies all services, and require a firewall administrator to re-enable services after a firewall has failed.

DFirewalls shall not accept traffic on its external interfaces that appear to be coming from internal network addresses.

Suggested Answer: B

Unless approved by the Network Services manager, all in-bound services shall be intercepted and processed by the firewall. Allowing unrestricted services inbound and outbound is certainly NOT recommended and very dangerous.

Pay close attention to the keyword: all

All of the other choices presented are recommended practices for a firewall policy.

Reference(s) used for this question:

GUTTMAN,

Barbara & BAGWILL, Robert, NIST Special Publication 800-xx, Internet Security Policy: A Technical Guide, Draft Version, May 25, 2000 (page 78).

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11 comments · newest first

Mary 11 months ago

Wait, people actually allow all services? That sounds risky!

Adrianna 12 months ago

D is a must-have rule, can't let internal traffic leak out!

Jacki 12 months ago

C seems a bit extreme, what if there's an emergency?

Annalee 12 months ago

Totally agree with A, source routing can be a huge risk!

Vannessa 1 year ago

B is definitely inappropriate, that's just asking for trouble.

Brice 1 year ago

Option D makes sense to me because accepting internal traffic on external interfaces could lead to spoofing attacks, so I think that's a good rule.

Alline 1 year ago

I feel like we had a practice question about firewall configurations failing safely, so option C might be okay, but I'm not completely confident.

Tamesha 1 year ago

I remember we discussed how allowing all services through a firewall is a huge security risk, so I think option B is definitely inappropriate.

Luke 1 year ago

I'm not entirely sure, but I think source routing can be a vulnerability, so option A seems like a good rule to have.

Hubert 1 year ago

Okay, let's think this through step-by-step. The question is asking about a feature found ONLY in sensor-based ML, so we need to eliminate the options that are also found in other types of ML. I'm going to go with option C - real-time offline protection.

Tequila 1 year ago

The Meraki full stack, huh? I remember learning about that in class, but I can't quite recall the details. I'll have to eliminate the options I'm sure are wrong and then make an educated guess.

ISC2 SSCP Exam - Topic 6 Question 44 Discussion