JNCIS-SP: Juniper Networks Certified Specialist – Service Provider Routing (2023) — Question 57

Which two statements are correct about BGP? (Choose two.)

Answer options

• A. IBGP neighbors must use the same AS number.
• B. By default, the TTL on product-related packets for external neighbors is set to 1.
• C. EBGP neighbors must use the same AS number.
• D. By default, the TTL on protocol-related packets for internal neighbors is set to 1.

Correct answer: A, B

Explanation

Option A is correct because IBGP neighbors indeed share the same AS number for proper routing. Option B is also correct as the default TTL for packets between external BGP neighbors is set to 1 to prevent routing loops. Options C and D are incorrect; EBGP neighbors must have different AS numbers, and the default TTL for internal neighbors is typically greater than 1.