Given that BlackBerry device users in the Vancouver office experience message latency during core business hours, what is the most likely cause? (Choose one.)

Question

Options

• AThese users were moved from the Vancouver Microsoft Exchange Server to the San Francisco
• BSeveral users were downloading large attachments
• CThe latency between the Vancouver office and San Francisco office was up to 70ms.
• DThere was an upgrade to the firewall software, which caused a temporary shutdown of port
• EThe BlackBerry MDS Connection Service has reached its maximum connection limits

• A
  5% (2)
• B
  14% (6)
• C
  74% (32)
• D
  7% (3)

Explanation

Option C is correct because BlackBerry Enterprise Server (BES) acts as a relay for all device messages - meaning every message from a Vancouver device must travel to the BES (in San Francisco), then back. A 70ms one-way link means each message round-trip compounds that delay, and during peak business hours when traffic volume is highest, this latency becomes noticeably disruptive.

Why the distractors fail:

• A - Migrating mailboxes to a different Exchange Server might cause temporary sync issues, but BES handles message delivery independently of which Exchange Server hosts the mailbox; this wouldn't explain latency during business hours specifically.
• B - Large attachment downloads strain bandwidth but would affect all network users intermittently, not produce consistent latency tied to business hours for BlackBerry users alone.
• D - A port being shut down by a firewall upgrade would cause a complete outage (no messages at all), not latency; partial slowdowns are not a typical symptom of a closed port.
• E - MDS Connection Service limits affect application/web data sessions, not core email message delivery, which routes through a separate BES component.

Memory tip: Picture BES as a mandatory "middleman" that every BlackBerry message must visit. The farther away that middleman is, the longer you wait - so geography = latency, making network distance (C) the first suspect whenever BlackBerry users in a remote office report slowness.

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