hardMultiple ChoiceObjective-mapped
200-201 Practice Question: Refer to the exhibit
Exhibit
access-list 101 permit tcp any host 10.1.1.100 eq 80 access-list 101 permit tcp any host 10.1.1.100 eq 443 access-list 101 deny ip any any interface GigabitEthernet0/0 ip access-group 101 in
Refer to the exhibit. A network administrator applied this ACL inbound on the external interface of a firewall. An attacker sends a TCP SYN packet with source IP 192.0.2.1 to destination 10.1.1.100 port 80. Which statement accurately describes the packet's treatment?
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 packet is permitted by the first ACE
The ACL permits TCP traffic to destination 10.1.1.100 on port 80, so the TCP SYN packet matches the first ACE and is permitted. Therefore, Option D is correct. Option A is incorrect because the ACL does deny certain traffic (e.g., non-matching packets are subject to implicit deny). Option B is incorrect because the packet matches an explicit permit before the implicit deny is reached. Option C is incorrect because the ACL does not require a source IP permit; the first ACE permits based on destination and protocol.
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 packet is permitted because the ACL only denies non-TCP traffic
Why it's wrong here
ACL permits specified TCP ports but denies all other traffic.
- ✗
The packet is denied by the implicit deny at the end
Why it's wrong here
It matches a permit line first, so implicit deny not reached.
- ✗
The packet is denied because there is no permit for source 192.0.2.1
Why it's wrong here
The ACL permits any source.
- ✓
The packet is permitted by the first ACE
Why this is correct
The first line matches TCP any to host 10.1.1.100 on port 80.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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