350-601 Security Practice Question
A data center engineer configures an ACL on a Nexus 9000 switch to block all traffic from the management network (10.10.0.0/16) to the production servers (192.168.1.0/24) except for SSH access from a specific jump host (10.10.1.100). The ACL is applied inbound on the management interface. Which ACL entry is correctly ordered to achieve this requirement?
⚠ Common exam trap
The trap here is that candidates often place the deny rule first, forgetting that ACLs are first-match and that the exception for the jump host must be evaluated before the broader deny rule.
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
✓
permit tcp host 10.10.1.100 192.168.1.0 0.0.0.255 eq 22 deny ip 10.10.0.0 0.0.255.255 192.168.1.0 0.0.0.255 permit ip any any
ACLs are processed top-down, and the first match wins. The explicit permit for SSH from the jump host (10.10.1.100) must come before the deny for the entire 10.10.0.0/16 range to ensure the exception is honored. The final permit ip any any allows all other non-management traffic, which is necessary to avoid dropping legitimate traffic on the management interface.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
permit ip any any deny ip 10.10.0.0 0.0.255.255 192.168.1.0 0.0.0.255 permit tcp host 10.10.1.100 192.168.1.0 0.0.0.255 eq 22
Why it's wrong here
Permits all before deny, making deny useless.
- ✗
permit tcp host 10.10.1.100 192.168.1.0 0.0.0.255 eq 22 permit ip any any deny ip 10.10.0.0 0.0.255.255 192.168.1.0 0.0.0.255
Why it's wrong here
Permits all traffic after SSH, opening full access.
- ✓
permit tcp host 10.10.1.100 192.168.1.0 0.0.0.255 eq 22 deny ip 10.10.0.0 0.0.255.255 192.168.1.0 0.0.0.255 permit ip any any
Why this is correct
Correct order: permit specific, deny source, permit rest.
- ✗
deny ip 10.10.0.0 0.0.255.255 192.168.1.0 0.0.0.255 permit tcp host 10.10.1.100 192.168.1.0 0.0.0.255 eq 22 permit ip any any
Why it's wrong here
Denies management traffic before permitting jump host, blocking SSH.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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