The correct answer is that incoming BitTorrent traffic using ports 6881-6889 is blocked. This is because the ACL explicitly denies both TCP and UDP on that port range, and BitTorrent typically operates over these ports for peer-to-peer file sharing. Since the ACL is applied inbound on the WAN interface, any traffic arriving from the internet destined for those ports is dropped, while the subsequent permit any any statement allows all other traffic through. On the Cisco CyberOps Associate 200-201 exam, this question tests your understanding of how ACLs filter traffic based on port numbers and direction, a common scenario in network security monitoring. A frequent trap is assuming the ACL blocks all BitTorrent traffic or that it affects outbound traffic, but the key is to note the specific port range and the inbound application. For a quick memory tip, think “6881-6889, deny and you’ll be fine” — those ports are the classic BitTorrent range, and blocking them inbound stops incoming peer connections.
200-201 Security Policies and Procedures Practice Question
This 200-201 practice question tests your understanding of security policies and procedures. Read the scenario carefully and evaluate each option against the stated constraints before committing to an answer. 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.
```
interface GigabitEthernet0/0
ip access-group BLOCK_P2P in
!
ip access-list extended BLOCK_P2P
deny tcp any any eq 6881 6889
deny udp any any range 6881 6889
permit ip any any
```
Refer to the exhibit. A network administrator applies this ACL to the WAN interface. What is the effect on BitTorrent traffic (which typically uses ports 6881-6889)?
Refer to the exhibit.
```
interface GigabitEthernet0/0
ip access-group BLOCK_P2P in
!
ip access-list extended BLOCK_P2P
deny tcp any any eq 6881 6889
deny udp any any range 6881 6889
permit ip any any
```
A
All TCP traffic is blocked
Why wrong: Only TCP on ports 6881-6889 is blocked; other TCP traffic is permitted.
B
Only outgoing BitTorrent traffic is blocked
Why wrong: The ACL is applied inbound, so it affects incoming traffic, not outgoing.
C
Incoming BitTorrent traffic using ports 6881-6889 is blocked
The ACL denies those ports inbound, blocking incoming BitTorrent connections.
D
All BitTorrent traffic is permitted
Why wrong: The ACL specifically denies the ports commonly used by BitTorrent.
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Incoming BitTorrent traffic using ports 6881-6889 is blocked
Option D is correct. The ACL denies TCP and UDP on ports 6881-6889 and permits everything else. BitTorrent uses these ports, so it is blocked in the inbound direction. Option A is wrong because it only denies those ports. Option B is wrong because it blocks only those specific ports. Option C is wrong because the permit any any allows all other traffic.
Key principle: ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
All TCP traffic is blocked
Why it's wrong here
Only TCP on ports 6881-6889 is blocked; other TCP traffic is permitted.
✗
Only outgoing BitTorrent traffic is blocked
Why it's wrong here
The ACL is applied inbound, so it affects incoming traffic, not outgoing.
✓
Incoming BitTorrent traffic using ports 6881-6889 is blocked
Why this is correct
The ACL denies those ports inbound, blocking incoming BitTorrent connections.
Related concept
Standard ACLs match source addresses.
✗
All BitTorrent traffic is permitted
Why it's wrong here
The ACL specifically denies the ports commonly used by BitTorrent.
Common exam traps
Common exam trap: ACLs stop at the first match
ACLs are processed top to bottom. The first matching entry wins, and an implicit deny usually exists at the end.
Detailed technical explanation
How to think about this question
ACL questions test precision: source, destination, protocol, port and direction. A generally correct ACL can still fail if it is applied on the wrong interface or in the wrong direction.
KKey Concepts to Remember
Standard ACLs match source addresses.
Extended ACLs can match source, destination, protocol and ports.
The first matching ACL entry is used.
There is usually an implicit deny at the end.
TExam Day Tips
→Check inbound versus outbound direction.
→Read the ACL from top to bottom.
→Look for a broader permit or deny above the intended line.
Key takeaway
ACLs process entries top to bottom and stop at the first match. Entry order and interface direction matter as much as the permit or deny statement.
Real-world example
How this comes up in practice
A security administrator must allow nursing staff to reach a patient records server while blocking access from the guest Wi-Fi VLAN. After applying an extended ACL, traffic is still blocked from nursing workstations. The ACL was applied outbound instead of inbound on the wrong interface. Questions like this test ACL direction and placement rules.
What to study next
Got this wrong? Here's your next step.
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 200-201 ACL questions on filtering logic and placement.
Security Policies and Procedures — This question tests Security Policies and Procedures — Standard ACLs match source addresses..
What is the correct answer to this question?
The correct answer is: Incoming BitTorrent traffic using ports 6881-6889 is blocked — Option D is correct. The ACL denies TCP and UDP on ports 6881-6889 and permits everything else. BitTorrent uses these ports, so it is blocked in the inbound direction. Option A is wrong because it only denies those ports. Option B is wrong because it blocks only those specific ports. Option C is wrong because the permit any any allows all other traffic.
What should I do if I get this 200-201 question wrong?
Review ACL processing order, placement rules (standard near destination, extended near source), and inbound vs outbound direction. Study wildcard masks and implicit deny. Then practise related 200-201 ACL questions on filtering logic and placement.
What is the key concept behind this question?
Standard ACLs match source addresses.
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