mediumMultiple ChoiceObjective-mapped
SSCP Practice Question: Refer to the exhibit
Exhibit
access-list 100 deny icmp any any echo-request access-list 100 permit ip any any ! interface GigabitEthernet0/0 ip access-group 100 in
Refer to the exhibit. An administrator applies this ACL to the external interface. What specific traffic is blocked?
⚠ Common exam trap
Watch out — candidates often assume 'ping' is a single protocol or that blocking ping requests also blocks replies, but Cisco tests the distinction between ICMP echo-request (type 8) and echo-reply (type 0) in ACLs.
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
✓
All ping requests
The ACL is applied to the external interface and denies ICMP echo-request (type 8) packets while permitting ICMP echo-reply (type 0) packets. This blocks only ping requests (echo-requests) from entering the network, but allows ping replies (echo-replies) to return for outbound-initiated traffic. Therefore, option D is correct because the ACL specifically targets and blocks all ping requests.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Both ping requests and replies
Why it's wrong here
Only echo-request is denied; echo-reply is permitted.
- ✗
Only ping replies
Why it's wrong here
The ACL targets echo-request, not echo-reply.
- ✗
All ICMP traffic
Why it's wrong here
Only echo-request is denied; other ICMP types (e.g., echo-reply, destination unreachable) are permitted.
- ✓
All ping requests
Why this is correct
The deny statement blocks all ICMP echo-request messages, i.e., ping requests.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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