The router selects the route with the longest prefix match for the destination IP address. The IP address 172.16.1.10 matches all three routes, but with different prefix lengths:
172.16.0.0/12 (prefix length 12)
172.16.0.0/16 (prefix length 16)
172.16.1.0/24 (prefix length 24)
The route with the /24 prefix length (172.16.1.0/24 via Interface C) is the most specific match because it has the longest prefix. Therefore, the router will forward the packet through Interface C. The other interfaces have shorter prefix lengths and are less specific matches.
Ask Bash
Bash is our AI bot, trained to help you pass your exam. AI Generated Content may display inaccurate information, always double-check anything important.
What is the importance of a longest prefix match in routing?
Open an interactive chat with Bash
How does CIDR notation, like /24, help identify subnet prefixes?
Open an interactive chat with Bash
What happens if two routes have the same prefix length in a router's table?
Open an interactive chat with Bash
Cisco CCNA 200-301
IP Connectivity
Your Score:
Report Issue
Bash, the Crucial Exams Chat Bot
AI Bot
Loading...
Loading...
Loading...
Pass with Confidence.
IT & Cybersecurity Package
You have hit the limits of our free tier, become a Premium Member today for unlimited access.
Military, Healthcare worker, Gov. employee or Teacher? See if you qualify for a Community Discount.
Monthly
$19.99
$19.99/mo
Billed monthly, Cancel any time.
3 Month Pass
$44.99
$14.99/mo
One time purchase of $44.99, Does not auto-renew.
MOST POPULAR
Annual Pass
$119.99
$9.99/mo
One time purchase of $119.99, Does not auto-renew.
BEST DEAL
Lifetime Pass
$189.99
One time purchase, Good for life.
What You Get
All IT & Cybersecurity Package plans include the following perks and exams .