Quick Answer
The correct answer is SSH, as the access control list port identification for SSH points directly to TCP port 22. This is because an ACL that permits inbound TCP traffic to port 22 is specifically allowing Secure Shell connections, which provide encrypted remote administration and secure command-line access to network devices. On the Cisco CyberOps Associate 200-201 exam, this concept tests your ability to map well-known port numbers to their corresponding services, a fundamental skill for analyzing ACL configurations and interpreting traffic filters. A common trap is confusing SSH (port 22) with Telnet (port 23) or HTTP (port 80), so always double-check the port number in the ACL entry rather than relying on the protocol name alone. Remember the mnemonic: "SSH on 22, secure and true; Telnet on 23, clear text for you."
This 200-201 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.
access-list 100 permit tcp any any eq 22 access-list 100 deny ip any any
Refer to the exhibit. What traffic is the router permitting?
access-list 100 permit tcp any any eq 22 access-list 100 deny ip any any
Telnet
Why wrong: Telnet uses port 23, not 22.
HTTP
Why wrong: HTTP uses port 80.
SSH
Port 22 is used by SSH.
FTP
Why wrong: FTP uses ports 20 and 21.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
SSH
The router is permitting SSH traffic because the access control list (ACL) matches TCP port 22, which is the default port for SSH. SSH provides encrypted remote administration, and the ACL entry permits inbound TCP connections to port 22, allowing secure shell access to the router.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
For each option: why learners choose it and why it is or isn't the right answer here.
Common exam traps
Cisco often tests the association between common services and their default port numbers, and the trap here is confusing SSH (port 22) with Telnet (port 23) or assuming HTTP/HTTPS (ports 80/443) are permitted when only port 22 is explicitly allowed.
Detailed technical explanation
SSH (Secure Shell) operates over TCP port 22 and provides encrypted authentication and data transfer, unlike Telnet which sends credentials in cleartext. The ACL shown is a standard extended ACL that permits only TCP traffic with a destination port of 22, effectively creating a firewall rule that restricts remote management to SSH only. In real-world deployments, this is a common security best practice to disable Telnet and allow only SSH for device management.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
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
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FAQ
Security Concepts — This question tests Security Concepts — Read the scenario before looking for a memorised answer..
The correct answer is: SSH — The router is permitting SSH traffic because the access control list (ACL) matches TCP port 22, which is the default port for SSH. SSH provides encrypted remote administration, and the ACL entry permits inbound TCP connections to port 22, allowing secure shell access to the router.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Read the scenario before looking for a memorised answer.
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Last reviewed: Jun 25, 2026
This 200-201 practice question is part of Courseiva's free Cisco certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the 200-201 exam.
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