JNCIS-ENT: Juniper Networks Certified Specialist – Enterprise Routing and Switching (2025) — Question 71

Which two statements are correct about link aggregation? (Choose two.)

Answer options

• A. IP traffic is hashed using source and destination MAC addresses.
• B. Member links must use the same MTU.
• C. All RE-generated traffic traverses the lowest member link.
• D. LAGs provide physical layer redundancy.

Correct answer: B, D

Explanation

Option B is correct because all member links in a link aggregation group must indeed have the same MTU to function properly. Option D is also correct as LAGs provide redundancy by allowing traffic to continue flowing even if one link fails. Options A and C are incorrect as they misrepresent the operations of link aggregation regarding traffic hashing and member link usage.