SP Network Infrastructure and Protocols 2

Question 1

What technology allows service providers to create isolated virtual networks over shared physical infrastructure?

Accepted Answer

VLANs

Answer

Virtual Local Area Networks (VLANs) logically segment a shared physical network so different customers or departments operate in isolated broadcast domains.

Question 2

In an MPLS VPN architecture, what is a Route Distinguisher (RD) used for?

Accepted Answer

Make overlapping customer IP addresses unique in the provider's VRF table

Answer

A Route Distinguisher prepends a unique value to customer IP prefixes so that overlapping addresses from different customers remain distinct in the provider's global routing table.

Question 3

Which monitoring protocol do service providers use to collect metrics from network devices like routers and switches?

Accepted Answer

SNMP

Answer

Simple Network Management Protocol (SNMP) is used to poll network devices for performance metrics, interface statistics, and fault notifications (traps).

Question 4

What is the purpose of Bidirectional Forwarding Detection (BFD) in service provider networks?

Accepted Answer

Rapidly detect link or path failures between network nodes

Answer

BFD provides fast failure detection by exchanging control packets at millisecond intervals, allowing routing protocols to converge much faster than native timers.

Question 5

A service provider uses RADIUS for what primary function?

Accepted Answer

Authentication, Authorization, and Accounting for network access

Answer

RADIUS (Remote Authentication Dial-In User Service) provides centralized AAA services, verifying user credentials and logging session data for billing and audit.

SP - Certified Service Provider Practice Test

SP - Certified Service Provider Practice Test

SP Network Infrastructure and Protocols 2