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WAN Availability and QoS

Chapter Description

In this sample chapter from CCNP Enterprise Design ENSLD 300-420 Official Cert Guide: Designing Cisco Enterprise Networks, you will review WAN methodologies and WAN availability with deployment models using MPLS, hybrid, and Internet designs. It also covers backup connectivity, failover designs, QoS strategies, and designing end-to-end QoS policies.

Review All Key Topics

Review the most important topics in the chapter, noted with the Key Topic icon in the outer margin of the page. Table 9-9 lists these key topics and the page number on which each is found.

key_topic_icon.jpg

Table 9-9 Key Topics

Key Topic Element

Description

Page

List

WAN design methodologies

300

Table 9-2

Key design principles

301

Table 9-3

Application requirements for data, voice, and video traffic

301

Table 9-4

Physical bandwidth comparison

302

Table 9-5

Availability percentages

303

List

Deployment models

304

Paragraph

Single-homed MPLS WANs

305

Paragraph

Dual-homed MPLS WANs

306

Paragraph

Hybrid WANs: Layer 3 VPN with Internet tunnels

306

List

Internet for remote sites

308

List

WAN backup options

309

Paragraph

Failover

310

Paragraph

DiffServ

311

Table 9-6

DSCP mapping table

311

Paragraph

IntServ

312

List

Classification technologies

312

Paragraph

Shaping

313

Paragraph

Policing

313

Paragraph

Queuing

313

Table 9-7

QoS options

313

Table 9-8

Link-efficiency mechanisms

315

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