The correct effect is that only TCP traffic destined to 192.168.1.100 on port 80 is permitted, while all other IP traffic is denied. This occurs because the extended ACL, applied inbound on the interface, contains a single permit statement for TCP from any source to that specific IP and port; Cisco ACLs automatically append an implicit deny all at the end, meaning any packet not matching that exact permit rule is dropped. On the Cisco SCOR 350-701 exam, this concept tests your understanding of how extended ACLs filter traffic based on protocol, source, destination, and port, and it often appears in scenario-based questions where a single permit entry is applied to an interface. A common trap is forgetting the implicit deny, leading candidates to assume unmatched traffic is allowed. Memory tip: think of an ACL as a bouncer with a strict list—only the names on the list get in, everyone else is turned away.
350-701 Security Concepts Practice Question
This 350-701 practice question tests your understanding of security concepts. 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 GigabitEthernet0/1
ip address 192.168.1.1 255.255.255.0
ip access-group INBOUND in
!
access-list 100 permit tcp any host 192.168.1.100 eq 80
access-list 100 deny ip any any
```
Refer to the exhibit. A network administrator applies the ACL to the interface. What is the effect on traffic inbound to the interface?
Refer to the exhibit.
```
interface GigabitEthernet0/1
ip address 192.168.1.1 255.255.255.0
ip access-group INBOUND in
!
access-list 100 permit tcp any host 192.168.1.100 eq 80
access-list 100 deny ip any any
```
A
All TCP traffic is permitted; other IP traffic is denied
Why wrong: Only TCP to port 80 is permitted, not all TCP.
B
Only TCP traffic destined to 192.168.1.100 on port 80 is permitted; all other IP traffic is denied
The ACL permits only HTTP to that host and denies the rest.
C
All IP traffic is permitted
Why wrong: The explicit deny blocks all other traffic.
D
The ACL is applied outbound, so it has no effect on inbound traffic
Why wrong: The ACL is applied inbound (ip access-group INBOUND in).
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Only TCP traffic destined to 192.168.1.100 on port 80 is permitted; all other IP traffic is denied
The ACL is applied inbound on the interface and contains a single entry that permits TCP traffic from any source to destination 192.168.1.100 on port 80. Because there is an implicit deny all at the end of every standard and extended ACL, only traffic matching this specific permit statement is allowed; all other IP traffic is denied.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
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 permitted; other IP traffic is denied
Only TCP traffic destined to 192.168.1.100 on port 80 is permitted; all other IP traffic is denied
Why this is correct
The ACL permits only HTTP to that host and denies the rest.
Related concept
Read the scenario before looking for a memorised answer.
✗
All IP traffic is permitted
Why it's wrong here
The explicit deny blocks all other traffic.
✗
The ACL is applied outbound, so it has no effect on inbound traffic
Why it's wrong here
The ACL is applied inbound (ip access-group INBOUND in).
Common exam traps
Common exam trap: answer the scenario, not the keyword
Cisco often tests the implicit deny all at the end of ACLs, and the trap here is that candidates may overlook that only the explicitly permitted traffic is allowed, assuming that a single permit statement implies all other traffic is also permitted.
Detailed technical explanation
How to think about this question
Extended ACLs evaluate packets in order; once a match is found, no further entries are processed. The implicit deny all at the end of the ACL is a fundamental security feature that blocks any traffic not explicitly permitted. In real-world scenarios, forgetting to add a permit statement for necessary traffic (e.g., ICMP for troubleshooting) can silently drop packets, leading to connectivity issues that are hard to diagnose.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A small business has 20 workstations on the 192.168.1.0/24 network and one public IP from its ISP. The router uses PAT (NAT overload) so all 20 devices share one public address using different source ports. NAT questions test whether you understand the four address terms and which direction each translation applies.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: Only TCP traffic destined to 192.168.1.100 on port 80 is permitted; all other IP traffic is denied — The ACL is applied inbound on the interface and contains a single entry that permits TCP traffic from any source to destination 192.168.1.100 on port 80. Because there is an implicit deny all at the end of every standard and extended ACL, only traffic matching this specific permit statement is allowed; all other IP traffic is denied.
What should I do if I get this 350-701 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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