Chapter 2

1:

Name the three network layer protocols that support the ISO CLNS.

A:

The three network layer protocols are CLNP, ES-IS, and IS-IS.

2:

In comparing the layers of the TCP/IP protocols suite and the ISO CLNS architecture, describe how the Internet Protocol (IP) differs from the ISO Connectionless Network Protocol (CLNP).

A:

In TCP/IP, the Internet Protocol is the only network layer protocol. CLNP coexists with other protocols such as ES-IS and IS-IS in the ISO CLNS architecture.

3:

What is the use of the Intradomain Routing Protocol Discriminator in the ISO network layer protocol packet headers?

A:

It plays the role of network layer protocol identifier and allows differentiation between the multiple ISO network layer protocols.

4:

What was IS-IS originally designed for?

A:

IS-IS was intended to be used as a dynamic routing protocol for routing Connectionless Network Protocol packets in the ISO CLNS environment.

5:

How is IS-IS used in an IP network?

A:

The IS-IS uses Type Length Value (TLV) fields for carrying routing information in IS-IS protocol packets. RFC 1195 specifies additional TLVs for carrying IP information in IS-IS packets, thus providing support for IP routing.

6:

Describe any similarities or differences between the ES-IS protocol and IP ARP.

A:

Both ARP and ES-IS are network host-level protocols for discovering adjacencies on connected media and provide network layer to data link layer address mapping.

IP ARP is used on only broadcast media and multipoint network media, whereas ES-IS also works over point-to-point links. Unlike ARP, Layer 3 to Layer 2 address mapping is a subset of the functionality provided by ES-IS. Other functions of ES-IS in the ISO CLNS environment are redirection and autoconfiguration.



IS-IS Network Design Solutions
IS-IS Network Design Solutions (Networking Technology)
ISBN: 1578702208
EAN: 2147483647
Year: 2005
Pages: 144
Authors: Abe Martey

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