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300-410 Practice Question: In MPLS, what is the default behavior of a Cisco…
In MPLS, what is the default behavior of a Cisco IOS-XE router regarding the 'auto-summary' command for BGP routes?
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
✓
Auto-summary is disabled by default for BGP.
By default, auto-summary is disabled in Cisco IOS-XE for BGP, meaning that BGP will not automatically summarize subnets to their classful boundaries.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Auto-summary is disabled by default for BGP.
Why this is correct
Cisco IOS-XE disables auto-summary by default for BGP since version 12.2(8)T.
- ✗
Auto-summary is enabled by default for BGP.
Why it's wrong here
Auto-summary is enabled by default for EIGRP and RIP, but not for BGP in modern IOS-XE.
- ✗
Auto-summary is enabled by default only for directly connected routes.
Why it's wrong here
Auto-summary applies to routes learned via the protocol, not just directly connected.
- ✗
Auto-summary is disabled by default for BGP but enabled for OSPF.
Why it's wrong here
OSPF does not use auto-summary; it uses area summarization.
Visual reference
Quick reference
IPv4 Address Class Summary
| Class | First Octet Range | Default Mask | Networks | Hosts per Network |
|---|---|---|---|---|
| A | 1–126 | /8 (255.0.0.0) | 126 | 16,777,214 |
| B | 128–191 | /16 (255.255.0.0) | 16,384 | 65,534 |
| C | 192–223 | /24 (255.255.255.0) | 2,097,152 | 254 |
| D | 224–239 | N/A | Multicast groups | — |
| E | 240–255 | N/A | Reserved / experimental | — |
127.x.x.x is reserved for loopback. Modern networks use CIDR (classless) rather than classful addressing.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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