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Exam 300-820 topic 1 question 40 discussion

Actual exam question from Cisco's 300-820
Question #: 40
Topic #: 1
[All 300-820 Questions]


Refer to the exhibit. An ISDN gateway is registered to Expressway-C with a prefix of 9 and/or it has a neighbor zone specified that routes calls starting with a 9.
Which value should be entered into the "Source" field to prevent toll fraud regardless at origin of the call?

  • A. Traversal Zone
  • B. Any
  • C. Neighbor Zone
  • D. All
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Suggested Answer: D 🗳️
by BangBang86 at Aug. 13, 2020, 6:40 a.m.

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BangBang86
Highly Voted 3 years, 9 months ago
There is no such parameter "All". It must be set to "Any".
upvoted 10 times
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Collabinski
Most Recent 1 year, 3 months ago
Tough question. If the exam specifies "All Zones" then that is the answer. • To minimize toll fraud risks, avoid using the "Any" wild card for the Source setting. To provide extra security you can set the rule's Source option to All zones. This means that the query is only sent to the target zone if it originated from any configured zone or the Local Zone. https://www.cisco.com/c/en/us/td/docs/voice_ip_comm/expressway/admin_guide/X14-0/exwy_b_cisco-expressway-administrator-guide/exwy_m_dial-plan-and-call-processing.html
upvoted 4 times
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TestingAAgain
1 year, 11 months ago
From the expressway help file below. The difference between the two is that any also blocks unregistered devices. I go with ANY as the answer The sources of the requests for which this rule applies. Any: locally registered devices, neighbor or traversal zones, and any non-registered devices. All zones: locally registered devices plus neighbor or traversal zones.
upvoted 2 times
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jonycakes
2 years, 4 months ago
Answer B: The dropdown options for the Source field are - *Any *All zones *Local Zone *Named Source: https://www.cisco.com/c/dam/en/us/td/docs/voice_ip_comm/expressway/config_guide/X8-8/Cisco-Expressway-Basic-Configuration-Deployment-Guide-X8-8.pdf
upvoted 4 times
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chamba87
3 years, 2 months ago
or maybe the answer make refference to any of the all 3 options above O_o ?
upvoted 1 times
Bazant
2 years, 4 months ago
No as possible choices at Expressway are: Any: locally registered devices, neighbor or traversal zones, and any non-registered devices. All zones: locally registered devices plus neighbor or traversal zones. Local Zone: locally registered devices only. Named: a specific zone or subzone. No "Neigbor Zone" or "Traversal Zone" available, so the any possible correct answer is B "Any"
upvoted 1 times
aocstr
9 months, 3 weeks ago
this would not prevent toll fraud though, tricky question
upvoted 1 times
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