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GUESTBOOK

18. Identify when to use ISDN BRI and PRI services and select the service that best suits a set of given requirements

Reference Point

R - Point between a Non-ISDN Terminal Device (TE2) and a Terminal Adapter (TA)
S - Point between a an ISDN Terminal Device (TE1) and the customer premises switching equipment (NT2)
T - Point between the NT2 and the local loop terminator (NT1)
U - Point between the NT1 and the ISDN local exchange (LE)

ISDN Terminology:

LE - Local Exchange
NT1 - Local loop terminator
NT2 - Customer premises switching equipment (CPE)
TE1 - ISDN terminal Equipment - ISDN Phone or Fax device
TA - Terminal adapter - Converts between analog and ISDN signaling
TE2 - Non-ISDN Terminal Equipment - Standard telephone

ISDN Protocol Prefixes

E - Recommended telephone networking standards
I - General methods, concepts, and terminology
Q - Signal and switching technology

Exam 18
SwitchingE64
SwitchingE66
SwitchingE67

Legacy Topics

64. Describe how Virtual Private Dialup Network (VPDN) operates.

VPDN uses the Layer 2 Forwarding protocol (L2F) which permits the tunneling of link level frames.

Using L2F tunneling, an Internet Service Provider (ISP) or other access service can create a virtual tunnel to link a customer's remote sites or remote users with corporate home networks. L2F passes protocol-level packets through the virtual tunnel between endpoints of a point-to-point connection.

Exam

66. Identify the configuration commands necessary to enable VPDN.

enable vpdn incoming
vpdn enable

Exam

67. Describe the commands necessary to verify and troubleshoot VPDN operation.

Troubleshooting command for VPDN operation

debug vpdn { errors | events | packets | l2f-errors | l2f-events | l2f-packets }

errors that prevent a tunnel from being established or errors that cause an established tunnel to be closed.
events that are part of normal tunnel establishment or shutdown.
packets exchanged from each protocol. This option may result in a large number of debug messages and should generally only be used on a debug chassis with a single active session.
l2f-errors that prevent L2F establishment or prevent its normal operation.
l2f-events that are part of normal tunnels establishment or shutdown for L2F.
l2f-packets protocol headers and status.

Exam

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