ExamTopics Logo
Mail Us[email protected]
Menu
Cisco Discussions
exam questions

Exam 400-007 All Questions

View all questions & answers for the 400-007 exam
Go to Exam

Exam 400-007 topic 1 question 8 discussion

Actual exam question from Cisco's 400-007
Question #: 8
Topic #: 1
[All 400-007 Questions]


Refer to the table. A customer investigates connectivity options for a DCI between two production data centers. The solution must provide dual 10G connections between locations with no single points of failure for Day 1 operations. It must also include an option to scale for up to 20 resilient connections in the second year to accommodate isolated SAN over IP and isolated dedicated replication IP circuits. All connectivity methods are duplex 10 Gbps. Which transport technology costs the least over two years in this scenario?

  • A. CWDM
  • B. DWDM
  • C. MPLS
  • D. Metro Ethernet
Show Suggested Answer Hide Answer
Suggested Answer: B 🗳️
by qtg9rMGmj23tFm4n02X4 at Nov. 7, 2022, 8:10 p.m.

Comments

Chosen Answer:
This is a voting comment (?). It is better to Upvote an existing comment if you don't have anything to add.
Switch to a voting comment New
Submit Cancel
qtg9rMGmj23tFm4n02X4
Highly Voted 7 months, 2 weeks ago
Selected Answer: B
the hint is the requirement 'option to scale for up to 20 resilient connections in the second year'. this effectively multiplies the estimated cost with 20 times. DWDM will leverage multiple lambdas across 2 x fibres to provide that scale without additional cost for each connection added. effectively scaling out is amortised into the original contract
upvoted 10 times
...
Devsin2000
Most Recent 3 months, 1 week ago
Selected Answer: D
MPLS Is out as it is not suitable for SAN traffic. The effective cost for DWDM and CWDM goes too high due to 5 years contract Metro Ethernet is cheapest because of the lower contract period.
upvoted 1 times
...
XalaGyan
1 year, 4 months ago
Selected Answer: B
I also vote for DWDM has no distance information is given. only contract term, cost and amount of expansion. DWDM is the safer choice in all of those compared to CWDM Answer B
upvoted 1 times
...
kzqc
1 year, 4 months ago
Selected Answer: A
It is CWDM. 'option to scale for up to 20 resilient connections in the second year' is a 10x increase from the dual 10G connections in the first year. CWDM can scale up to 18x.
upvoted 1 times
...
TonyGuo
1 year, 6 months ago
should be DWDM, scale for up to 20 resilient connections
upvoted 1 times
...
bdp123
2 years ago
Selected Answer: B
CWDM supports up to18 connections whereas DWDM supports 48 without extra cost https://www.commscope.com/blog/2019/cwdm-vs.-dwdm-decoding-the-differences-between-wave-division-multiplexing-options/
upvoted 4 times
...
gcpengineer
2 years, 2 months ago
Selected Answer: D
D is the cheapest
upvoted 2 times
...
gcpengineer
2 years, 2 months ago
the question is on cost and D is the ans
upvoted 1 times
...
Pal68
2 years, 3 months ago
Selected Answer: B
CWDM supports up to 18 wavelength channels transmitted through a fiber at the same time. To achieve this, the different wavelengths of each channel are 20nm apart. DWDM, supports up to 80 simultaneous wavelength channels, with each of the channels only 0.8nm apart. CWDM technology offers a convenient and cost-efficient solution for shorter distances of up to 70 kilometers. For distances between 40 and 70 kilometers, CWDM tends to be limited to supporting eight channels.
upvoted 3 times
...
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.

SaveCancel
exam
Someone Bought Contributor Access for:
SY0-701
London, 1 minute ago