The correct answers are:
B. Member links must use the same MTU.
D. LAGs provide physical layer redundancy.
Explanation:
B: In link aggregation, all member links must have the same Maximum Transmission Unit (MTU) to ensure proper functioning.
D: Link Aggregation (LAG) provides physical layer redundancy by bundling multiple physical links into a single logical link, increasing availability and reliability.
The other options are incorrect:
A: IP traffic is typically hashed using source and destination IP addresses, not MAC addresses.
C: RE-generated traffic does not necessarily traverse the lowest member link. The traffic distribution depends on the hash algorithm used.
Agree on traffice generated by the RE is always sent on the lowest member link. Additionally to one of the obvious purposes of a LAG which is having physical redundancy.
Since Speed and Duplex match is required for LACP to come up, but matching MTU not required. Even with Different MTU between two end points, can form LACP. This is true that All RE Generated traffic in JUNOS uses the lowest member link, and LAG provided physical layer redundancy. So C and D are correct answer.
B. Member links must use the same MTU.
• This is correct because, in a Link Aggregation Group (LAG), all member links must have identical settings, including the same MTU size. If the MTU sizes differ, the LAG may not function correctly.
D. LAGs provide physical layer redundancy.
• This is also correct because a LAG bundles multiple physical links into a single logical interface, providing redundancy. If one physical link fails, traffic can still flow over the remaining links.
Please explain why not just CD is correct answer.
I think C is wrong because the RE-generated traffic in Junos is load-balanced across LAG links based on the hash algorithm, not always traversing the lowest member link. In Junos, RE-generated traffic (e.g., routing protocol packets, control plane traffic) typically uses the lowest member link in a LAG by default. However, when we say "not always traversing the lowest member link," it means that under certain configurations or conditions, this behavior can change like modified configuration, failover scenarios or special features or hashing
B. Member links must use the same MTU.
All member links in a Link Aggregation Group (LAG) must have the same Maximum Transmission Unit (MTU) size. A mismatch in MTU will prevent the link from being part of the aggregation.
D. LAGs provide physical layer redundancy.
Link Aggregation Groups (LAGs) provide redundancy at the physical layer by aggregating multiple physical links into a single logical interface. If one link fails, the traffic is redistributed across the remaining links, ensuring continued connectivity.
B. Member links must use the same MTU.
- For link aggregation to work correctly, all member links must have the same MTU setting. This ensures uniformity across the links in the aggregate group.
D. LAGs provide physical layer redundancy.
- Link Aggregation Groups (LAGs) provide redundancy by bundling multiple physical links into a single logical link, offering redundancy and increasing bandwidth.
Explanation for incorrect options:
- A. IP traffic is hashed using source and destination MAC addresses.
- In Juniper, IP traffic in a LAG is usually hashed using various fields (like IP addresses, MAC addresses, etc.), but the exact fields used depend on the hashing algorithm configured.
- C. All RE-generated traffic traverses the lowest member link.
- This is incorrect, as RE (Routing Engine) traffic doesn't always traverse the lowest member link; it can use any link in the LAG based on the hashing mechanism.
C is correct, and you cannot configure MTU on an interface that wil be part of an aggregated, an error is displayed
upvoted 1 times
...
Log in to ExamTopics
Sign in:
Community vote distribution
A (35%)
C (25%)
B (20%)
Other
Most Voted
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
fasdf
2 weeks, 5 days agod525a96
3 weeks, 5 days agoveronag123
1 month, 1 week agoFR99
1 month, 1 week agoDIbyam
2 months, 1 week agoAndreyv
2 months, 2 weeks agoVMWorld
2 months, 4 weeks agoDIbyam
3 months, 1 week agomirko1976
3 months, 1 week agomirko1976
3 months, 1 week agojharosev2
3 months, 2 weeks agoWadakara
4 months agomr_espectro613
4 months, 1 week ago