300-320 Question #484: Real Exam Question with Answer & Explanation

The correct answer is C. Packets per second. VPN processing - encryption, decryption, and encapsulation - is performed on a per-packet basis, regardless of packet size. A device that can handle many small packets per second is the real bottleneck for VPN performance. Bits per second (throughput) is influenced by PPS, but if

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Question

What is the most important consideration when selecting a VPN termination device?

Options

ACPU cycles per second
BVPN sessions per interface
CPackets per second
DBits per second

Explanation

VPN processing - encryption, decryption, and encapsulation - is performed on a per-packet basis, regardless of packet size. A device that can handle many small packets per second is the real bottleneck for VPN performance. Bits per second (throughput) is influenced by PPS, but if the device cannot process each packet quickly enough, large-packet throughput figures are misleading. CPU cycles per second is a hardware detail abstracted away from the selection criteria, and 'VPN sessions per interface' addresses capacity, not raw processing ability. PPS is the fundamental metric for evaluating a VPN termination device's ability to sustain encrypted traffic under load.

Topics

#VPN termination#packets per second#device selection#VPN design

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