mediumMultiple ChoiceObjective-mapped
350-701 Practice Question: Refer to the exhibit
Exhibit
show asp drop Frame drop: No route to host 100 Access list deny 50 Flow blocked (other) 0 Flow drop: No valid session 20 Stateful ACL check failed 5 Cluster drop: 0
Refer to the exhibit. What is the most likely reason for the high number of 'No route to host' drops on a Cisco ASA?
⚠ Common exam trap
Cisco often tests the distinction between Layer 3 routing drops ('No route to host') and Layer 2/interface drops, or between routing issues and NAT/policy failures, so candidates must remember that 'No route to host' is exclusively a routing table lookup failure, not a firewall rule or interface problem.
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
✓
Missing static route on the ASA
The 'No route to host' drop on a Cisco ASA indicates that the firewall has no valid route in its routing table to reach the destination IP address of the packet. Option C is correct because a missing static route (or dynamic route) for the destination network prevents the ASA from performing a route lookup, causing it to drop the packet with this specific syslog message. This is a Layer 3 forwarding issue, not a policy or NAT problem.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Firewall is in transparent mode
Why it's wrong here
Transparent mode does not require routing; it bridges traffic.
- ✗
Interface is down
Why it's wrong here
If the interface were down, the drop reason would be 'interface not up' or similar.
- ✓
Missing static route on the ASA
Why this is correct
Without a route to the destination, the ASA cannot forward the packet.
- ✗
Incorrect NAT rule
Why it's wrong here
NAT issues would cause drops like 'no translation' or 'no xlate', not 'no route to host'.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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