CCNA Routing Table Questions Confusion

You’re staring at a routing table on the exam and freezing. The scenario describes a network topology. You know static routes are in there. You know OSPF is running. But you can’t figure out which route the packet will actually take. Your hands get cold. You skip it. Later your score report shows 702 — close enough to sting, not close enough to pass.

This is the single most common trap on the Cisco CCNA (200-301) exam that candidates don’t prepare for specifically.

The problem isn’t that routing tables are hard. The problem is that exam questions bury the answer under layers of distraction. They show you real routing table output mixed with bad assumptions you’re supposed to have already learned. They test whether you can instantly apply the rules without second-guessing yourself under time pressure.

Why Table Questions Confusion Trips Everyone Up

Most study materials teach routing tables backwards. They explain how a route gets into the table. Then they explain how to read it. What they don’t do is teach you the decision tree you actually need under exam conditions.

When you see a routing table, your brain is already tired. You’ve been testing for 45 minutes. You see three different routes to the same destination network. One is OSPF. One is static. One is RIP. Your eyes blur.

The exam doesn’t ask “which routing protocol is better.” It asks: “A packet arrives from Host A destined to 10.4.0.0/24. The routing table shows three possible routes. Which one does the router use?” And it’s multiple choice with two answers that seem right.

This is where confusion lives. You’ve never practiced the speed required to eliminate wrong answers in under 90 seconds.

Most candidates know that administrative distance (AD) determines preference. They know lower AD wins. But when they see a real routing table with OSPF (AD 110), EIGRP (AD 90), and a static route (AD 1), they overthink it. They wonder if there’s a trick. There isn’t. Static route wins every time. But they second-guess because they haven’t drilled this enough.

The Specific Pattern That Causes This

Exam routing table questions follow one pattern that catches 7 out of 10 candidates:

The question shows you a partial topology AND a routing table output AND then asks about traffic flow.

Here’s a real scenario structure from the exam:

Router Core1 has these routes in its table:
S 10.1.0.0/24 [1/0] via 10.2.1.1
O 10.1.0.0/25 [110/20] via 10.2.1.2
O 10.1.0.0/8 [110/50] via 10.2.1.3

A packet arrives at Core1 destined for 10.1.0.5.
Which next hop does the packet use?

This destroys candidates because:

There are three routes that could match 10.1.0.5
Most people know longest prefix match is the tiebreaker
But they don’t know it fast
And the exam mixes in routes with different ADs to confuse the priority order
You have 90 seconds to eliminate three wrong answers and be sure

The answer is 10.1.0.0/25 (via 10.2.1.2) because it’s the longest prefix match. /25 is longer than /24 and /8. Administrative distance doesn’t matter here — we only compare AD when the prefix length is the same.

But most candidates freeze because they see AD 1 (static) and think “static always wins.” That’s a half-truth that breaks under these exact conditions.

How The Exam Actually Tests This

The Cisco CCNA (200-301) tests routing tables in three ways:

Type 1: Which route wins when multiple routes exist to the same destination?

This is pure administrative distance. You see:

OSPF route to 10.0.0.0/24 (AD 110)
Static route to 10.0.0.0/24 (AD 1)
EIGRP route to 10.0.0.0/24 (AD 90)

Lower AD wins. Static wins. 10 seconds.

Type 2: Which route gets used when destinations have different prefix lengths?

This is longest prefix match, and AD becomes irrelevant. You see:

Static route to 10.0.0.0/8 (AD 1)
OSPF route to 10.1.0.0/16 (AD 110)
Packet destined to 10.1.5.5

OSPF route wins because /16 is longer than /8. AD doesn’t matter. Both match the destination. Longest wins.

Type 3: Combined confusion — multiple routes with different ADs and different prefix lengths.

This kills most candidates. The exam mixes both scenarios. You have to:

Filter routes that match the destination
Apply longest prefix match first
Use AD only if prefix lengths are identical

A real exam question looks like this:

Routing table for R1:
O 10.0.0.0/16 [110/50] via 192.168.1.1
O 10.1.0.0/24 [110/20] via 192.168.1.2
S 10.0.0.0/8 [1/0] via 192.168.1.3
D 10.0.0.0/8 [90/2500000] via 192.168.1.4

A packet destined to 10.1.5.5 arrives.
Which path does R1 use?
A) via 192.168.1.1 (OSPF)
B) via 192.168.1.2 (OSPF)
C) via 192.168.1.3 (Static)
D) via 192.168.1.4 (EIGRP)

Answer: B

Here’s why: 10.1.0.0/24 is the longest match for 10.1.5.5. It’s /24. The static and EIGRP routes to /8 are less specific. The OSPF /16 is less specific than /24. Match is done. Next hop is 192.168.1.2. Time to answer: 45 seconds if you know the pattern.

How To Recognize It Instantly

When you see a routing table question on your exam, use this three-step filter:

Step 1: Write down all routes that match the destination network.

Ignore everything else. If the destination is 10.1.5.5/32, you only care about routes that would forward that traffic. 10.0.0.0/8 matches. 10.1.0.0/24 matches. 10.2.0.0/16 does not.

Step 2: Find the longest prefix match among matching routes.

If 10.1.0.0/24 and 10.0.0.0/8 both match, /24 wins. Write it down. You’re done with steps 1 and 2 in 20 seconds.

Step 3: Only if two routes have the same prefix length, compare AD.

If you have two OSPF routes to 10.1.0.0/24 from different routers, the one with lower metric (remember, OSPF metric is not AD — metric is in the brackets) might win, but that’s not AD. Or if you have one OSPF and one static route to the exact same network, static wins because AD 1 beats AD 110.

Most candidates skip step 1 and jump to AD comparison. That’s where they fail.

Practice This Before Your Exam

You need 15 practice routing table questions done under timed conditions. Not conceptual questions. Not “explain administrative distance” questions. Real scenarios with table output.

Find 15 questions that show:

Actual routing table syntax (S, O, D, C)
Real prefix lengths (/8, /16, /24, /25, /30)
Multiple routes in one table
A destination IP and four answer choices

Set a timer for 90 seconds per question. If you get it wrong, rewind 15 seconds and walk through steps 1-3 out loud.

Do this five times over three days. By day three, you should finish in under 60 seconds and feel zero confusion.

If you’re still seeing these on your exam and you hesitate for more than 75 seconds, skip and come back. These are time traps. There’s no partial credit. Either you know the pattern or you don’t.

**Right now: