Exam SY0-701 topic 1 question 21 discussion

Actual exam question from CompTIA's SY0-701

Question #: 21
Topic #: 1

During a security incident, the security operations team identified sustained network traffic from a malicious IP address: 10.1.4.9. A security analyst is creating an inbound firewall rule to block the IP address from accessing the organization’s network. Which of the following fulfills this request?

A. access-list inbound deny ip source 0.0.0.0/0 destination 10.1.4.9/32
B. access-list inbound deny ip source 10.1.4.9/32 destination 0.0.0.0/0
C. access-list inbound permit ip source 10.1.4.9/32 destination 0.0.0.0/0
D. access-list inbound permit ip source 0.0.0.0/0 destination 10.1.4.9/32

Show Suggested Answer

Suggested Answer: B 🗳️

by Mehsotopes at May 8, 2024, 6:28 a.m.

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dbrowndiver

Highly Voted 9 months, 2 weeks ago

Selected Answer: B

Source: 10.1.4.9/32 specifies the exact malicious IP address to block. Destination: 0.0.0.0/0 indicates all possible destinations within the network. Action: deny specifies that traffic from this source IP should be blocked. • Scenario Application: Blocking Malicious IP: This rule effectively blocks any incoming traffic from the IP address 10.1.4.9 from accessing any part of the network. Inbound Rule: As an inbound rule, it prevents traffic from the specified IP from entering the network, which aligns with the requirement to block the malicious IP. This rule directly addresses the need to block the specified IP address, fulfilling the requirement by denying access to all destinations, effectively preventing any communication from the malicious IP.

upvoted 5 times

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PukaSudu

Most Recent 11 months, 3 weeks ago

Selected Answer: B

B. access-list inbound deny ip source 10.1.4.9/32

upvoted 1 times

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SHADTECH123

12 months ago

Selected Answer: B

B. access-list inbound deny ip source 10.1.4.9/32 destination 0.0.0.0/0 Explanation: This rule specifically denies all inbound traffic from the malicious IP address 10.1.4.9 to any destination within the network. This is the correct way to block the malicious IP address.

upvoted 3 times

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shady23

1 year ago

Selected Answer: B

B. access-list inbound deny ip source 10.1.4.9/32 destination 0.0.0.0/0

upvoted 1 times

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Mehsotopes

1 year ago

Selected Answer: B

/32 would cover all possible subnets, & their communicating devices within the IP range, & destination 0.0.0.0/0 would cover the gateway surface of your network.

upvoted 2 times

rjbb

1 year ago

A correction to this, /32 would block only this IP address. but B is still the correct answer.

upvoted 3 times

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