How does the AS path length affect BGP path selection?

Shorter AS paths are preferred over longer ones

AS path length is only considered if local preference is equal

Longer AS paths are preferred because they indicate more reliable routes

AS path length is used to break ties between equal-cost paths

A BGP router has two paths to the same destination. Path A has AS path 65001 65002 and origin IGP. Path B has AS path 65001 65002 and origin incomplete. No weight, local preference, or MED is configured. Which path will be selected?

Path B, because it has a shorter AS path

Both paths will be load-balanced

Path A, because origin IGP is preferred over incomplete

Path B, because origin incomplete is preferred over IGP

A service provider has two links to the same customer AS. The customer advertises the same prefix on both links. The provider wants to prefer the link with the lower MED for inbound traffic. Both links are from the same neighboring AS. Which configuration will achieve this?

Configure a route map on the provider's neighbor statements to set a lower MED on one link

Configure a higher weight on one link

Configure a higher local preference on one link

Configure AS path prepending on one link

A router has two paths to the same destination. Path A is learned from an eBGP peer with an IGP metric of 100 to the next hop. Path B is learned from an iBGP peer with an IGP metric of 50 to the next hop. Both paths have identical weight, local preference, AS path length, origin, and MED. Which path will be selected?

Path B, because it has a lower IGP metric to the next hop

Path A, because eBGP paths are preferred over iBGP paths

Path B, because it is the oldest route

Both paths will be load-balanced

What does the IGP metric to the BGP next hop determine in path selection?

The best path based on the AS path length

The best path based on the MED value

The best path based on the origin type

The closest exit point to reach the BGP next hop

CiscoCertified Network Professional Service Provider

Domain 2Objective 3

2.3 Describe BGP Path Selection Algorithm. 350-501 Practice Questions (Page 5)

Part of the Networking domain, which accounts for 30% of the 350-501 exam. Cisco does not publish an official question count, but from its 120-minute exam (~50–80 total, ~15–24 in this domain), expect 2–3 from this objective — we provide 26 practice questions to prepare you well beyond it. (estimate)

26questions here

6free pages

11concepts

30%of the exam

Questions 21–25

21foundation · easy
How does the AS path length affect BGP path selection?
Select an answer first
22application · medium
A BGP router has two paths to the same destination. Path A has AS path 65001 65002 and origin IGP. Path B has AS path 65001 65002 and origin incomplete. No weight, local preference, or MED is configured. Which path will be selected?
Select an answer first
23application · medium
A service provider has two links to the same customer AS. The customer advertises the same prefix on both links. The provider wants to prefer the link with the lower MED for inbound traffic. Both links are from the same neighboring AS. Which configuration will achieve this?
Select an answer first
24expert · hard
A router has two paths to the same destination. Path A is learned from an eBGP peer with an IGP metric of 100 to the next hop. Path B is learned from an iBGP peer with an IGP metric of 50 to the next hop. Both paths have identical weight, local preference, AS path length, origin, and MED. Which path will be selected?
Select an answer first
25foundation · easy
What does the IGP metric to the BGP next hop determine in path selection?
Select an answer first

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