Question 1mediummulti select
Full question →mediummulti selectObjective-mapped
Which two statements accurately describe default routes in a routed network?
Answer choices
Why each option matters
Good practice is not just finding the correct option. The wrong answers often show the exact trap the exam wants you to fall into.
A
Best answer
A default route is used when no more specific route matches.
This is correct because that is the core purpose of a default route.
B
Best answer
A default route is commonly represented as 0.0.0.0/0 in IPv4.
This is correct because 0.0.0.0/0 is the standard IPv4 default route notation.
C
Distractor review
A default route is always preferred over connected routes.
This is wrong because more specific routes, including connected routes, are preferred first.
D
Distractor review
A default route can exist only when dynamic routing is disabled.
This is wrong because default routes can coexist with dynamic routing protocols.
E
Distractor review
A default route removes the need for route selection logic.
This is wrong because the router still checks for more specific matches before using the default.
Common exam trap
Common exam trap: answer the scenario, not the keyword
A common exam trap is to incorrectly believe that a default route always takes precedence over other routes. Some candidates assume the default route is the primary path for all traffic, ignoring the longest prefix match rule. This misunderstanding leads to the false conclusion that connected or static routes are overridden by the default route. In reality, the router always prefers the most specific route available, and the default route is only used when no other route matches. Misinterpreting this can cause incorrect answers about routing behavior and route preference in the exam.
Technical deep dive
How to think about this question
A default route in IP routing is a special type of route that matches all possible destination IP addresses that do not have a more specific match in the routing table. It is commonly represented as 0.0.0.0/0 in IPv4, which means it covers the entire IPv4 address space. Routers use default routes as a last resort to forward packets when no other route entries match the destination address. This mechanism is essential for simplifying routing tables, especially in smaller or branch networks where maintaining full routing information is impractical. When a router receives a packet, it performs a longest prefix match against its routing table entries. If no specific route matches the destination IP, the router then checks if a default route exists. If so, it forwards the packet according to the default route. This decision process ensures that more specific routes, such as connected or static routes, always take precedence over the default route. The default route acts as a catch-all path, typically pointing towards an upstream router or Internet gateway. A common exam trap is to assume that the default route is always preferred or that it overrides connected or static routes. In reality, the default route is only used when no other route matches. This behavior prevents traffic from being misrouted and ensures efficient routing decisions. Practically, default routes are widely used at network edges and branch offices to simplify routing and reduce overhead, while core routers maintain detailed routing tables with specific routes.
KKey Concepts to Remember
- A default route is used by a router only when no more specific route matches the destination IP address in the routing table.
- The IPv4 default route is represented as 0.0.0.0/0 and matches all possible IPv4 addresses not covered by other routes.
- Routers perform longest prefix matching and prefer more specific routes over the default route when forwarding packets.
- Default routes can coexist with dynamic routing protocols and do not require dynamic routing to be disabled.
- A default route acts as a route of last resort, providing a fallback path for unknown or less specific destinations.
- Connected and static routes have higher routing preference than default routes due to their more specific prefix length.
- Using default routes reduces routing table size and complexity at branch or edge routers by summarizing unknown destinations.
- The default route does not eliminate route selection logic; routers still evaluate all routes before using the default.
TExam Day Tips
- Watch for words such as best, first, most likely and least administrative effort.
- Review why wrong options are wrong, not only why the correct option is correct.
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More questions from this exam
Keep practising from the same exam bank, or move into a focused topic page if this question exposed a weak area.
Question 1
A router learns the same prefix from both OSPF and EIGRP. Which route is installed by default?
Question 2
A router shows this output: R1#show ip ospf neighbor Neighbor ID Pri State Dead Time Address Interface 10.1.1.2 1 FULL/DR 00:00:34 192.168.12.2 GigabitEthernet0/0 10.1.1.3 1 2WAY/DROTHER 00:00:39 192.168.12.3 GigabitEthernet0/0 Which statement is correct?
Question 3
What is the OSPF metric called?
Question 4
A non-root switch has two uplinks toward the root bridge. One path has a lower total STP cost than the other. What role will the lower-cost uplink have?
Question 5
A router interface applies this ACL inbound: 10 deny tcp any any eq 80 20 permit ip any any A user reports that web browsing to a server by IP address fails, but ping works. Which statement best explains the behavior?
Question 6
A router learns route 198.51.100.0/24 from OSPF with AD 110 and also has a static route to the same prefix configured with AD 150. Which route is installed?
FAQ
Questions learners often ask
What does this 200-301 question test?
A default route is used by a router only when no more specific route matches the destination IP address in the routing table.
What is the correct answer to this question?
The correct answer is: A default route is used when no more specific route matches. — A default route is a fallback path used when no more specific route matches the destination. In plain language, it gives the router somewhere to send traffic that does not match any better entry in the routing table. That makes it especially useful at branch sites and Internet edges where an upstream path exists for all unknown destinations. A default route does not replace more specific routes; it complements them. This is a key routing concept because learners sometimes assume the default route is always used first or that it eliminates the value of other routes. In reality, the default route is a route of last resort. The correct answers are the ones that reflect that fallback role and its relationship with more specific prefixes.
What should I do if I get this 200-301 question wrong?
Then try more questions from the same exam bank and focus on understanding why the wrong options are tempting.
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