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300-410 Practice Question: Examine the following partial configuration on a…
Examine the following partial configuration on a Cisco IOS-XE router:
interface GigabitEthernet0/1 ip address 192.168.1.1 255.255.255.0 ip access-group MY_ACL in
!
access-list 100 permit tcp any host 192.168.1.1 eq 22 access-list 100 deny ip any any
!
line vty 0 4
transport input ssh login local !
username admin privilege 15 secret cisco
What is the effect of this configuration?
⚠ Common exam trap
Cisco often tests the distinction between inbound and outbound ACL application, and candidates may mistakenly think the 'in' keyword means 'into the router' for management traffic only, or they may overlook that the ACL is applied to the interface and filters all IP traffic, not just management plane traffic.
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
✓
Only SSH connections to the router are permitted; all other IP traffic is denied inbound on this interface.
The ACL 100 is applied inbound on GigabitEthernet0/1 via the 'ip access-group MY_ACL in' command. It explicitly permits TCP traffic to host 192.168.1.1 on port 22 (SSH) and then denies all other IP traffic. Since the router's own IP address is 192.168.1.1, this allows only SSH management access from any source, while blocking all other inbound traffic to the router or through the 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.
- ✓
Only SSH connections to the router are permitted; all other IP traffic is denied inbound on this interface.
Why this is correct
The ACL permits TCP port 22 (SSH) and denies all other IP traffic, applied inbound. This restricts management access to SSH only.
- ✗
The ACL permits SSH and HTTP traffic to the router; all other traffic is denied.
Why it's wrong here
The ACL only permits TCP port 22 (SSH), not HTTP (port 80).
- ✗
The ACL is applied outbound, so it filters traffic leaving the interface; SSH is permitted outbound.
Why it's wrong here
The 'ip access-group MY_ACL in' applies the ACL inbound, not outbound.
- ✗
The ACL has no effect because it is missing a 'permit ip any any' statement.
Why it's wrong here
The ACL explicitly denies all other traffic with 'deny ip any any', which is effective. No further permit is needed for the intended restriction.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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