自頂向下網(wǎng)絡(luò)設(shè)計(jì)

內(nèi)容概要

　　本書(shū)是圍繞自頂向下網(wǎng)絡(luò)設(shè)計(jì)步驟編寫(xiě)的，提供給網(wǎng)絡(luò)設(shè)計(jì)者一種系統(tǒng)的結(jié)構(gòu)化網(wǎng)絡(luò)設(shè)計(jì)方法。
　　本書(shū)分為4個(gè)部分，即客戶需求和目標(biāo)、邏輯網(wǎng)絡(luò)設(shè)計(jì)、物理網(wǎng)絡(luò)設(shè)計(jì)，以及網(wǎng)絡(luò)測(cè)試、優(yōu)化和文檔編寫(xiě)。4個(gè)部分分別對(duì)應(yīng)著網(wǎng)絡(luò)
設(shè)計(jì)的各個(gè)重要階段，每個(gè)階段都提供給讀者詳細(xì)的設(shè)計(jì)指導(dǎo)原則，內(nèi)容涵蓋網(wǎng)絡(luò)設(shè)計(jì)的方方面面。本書(shū)從用戶商業(yè)和技術(shù)目標(biāo)的分析入手，從而制定出相應(yīng)的網(wǎng)絡(luò)流量、負(fù)載和qos需求，進(jìn)而開(kāi)發(fā)網(wǎng)絡(luò)的邏輯拓?fù)浣Y(jié)構(gòu)，然后進(jìn)入地址規(guī)劃、協(xié)議選擇、網(wǎng)絡(luò)安全和網(wǎng)絡(luò)管理實(shí)施策略制定，最后是對(duì)網(wǎng)絡(luò)設(shè)備的選型建議以及網(wǎng)絡(luò)實(shí)施、測(cè)試和文檔編寫(xiě)。本書(shū)每章以復(fù)習(xí)題和設(shè)計(jì)環(huán)境作為一章的總結(jié)和回顧，理論與實(shí)踐相結(jié)合，從而讓讀者更好地理解和掌握自頂向下網(wǎng)絡(luò)設(shè)計(jì)的思想。
　　本書(shū)適合cisco代理商、網(wǎng)絡(luò)運(yùn)營(yíng)商、其他網(wǎng)絡(luò)設(shè)備商的網(wǎng)絡(luò)部署人員、售后技術(shù)支持人員閱讀；網(wǎng)絡(luò)維護(hù)人員，以及網(wǎng)絡(luò)技術(shù)愛(ài)好者也可以從本書(shū)中獲益。

作者簡(jiǎn)介

作者：(美國(guó))奧本海默(Priscilla Oppenheimer)

書(shū)籍目錄

introduction　xxii
part i　identifying your customer's needs and goals　
chapter 　analyzing business goals and constraints　
using a top-down network design methodology　
using a structured network design process　
systems development life cycles　
plan design implement operate optimize (pdioo) network life
cycle　
analyzing business goals　
working with your client　
changes in enterprise networks　
networks must make business sense　
networks offer a service　
the need to support mobile users　
the importance of network security and resiliency　
typical network design business goals　
identifying the scope of a network design project　
identifying a customer's network applications　
analyzing business constraints　
politics and policies　
.budgetary and staffing constraints　
project scheduling　
business goals checklist　
summary　
review questions　
design scenario　
chapter 　analyzing technical goals and tradeoffs　
scalability　
planning for expansion　
expanding access to data　
constraints on scalability　
availability　
disaster recovery　
specifying availability requirements　
five nines availability　
the cost of downtime　
mean time between failure and mean time to repair　
network performance　
network performance definitions　
optimum network utilization　
throughput　
throughput of internetworking devices　
application layer throughput　
accuracy　
efficiency　
delay and delay variation　
causes of delay　
delay variation　
response time　
security　
identifying network assets　
analyzing security risks　
reconnaissance attacks　
denial-of-service attacks　
developing security requirements　
manageability　
usability　
adaptability　
affordability　
making network design tradeoffs　
technical goals checklist　
summary　
review questions　
design scenario　
chapter 　characterizing the existing internetwork　
characterizing the network infrastructure　
developing a network map　
characterizing large internetworks　
characterizing the logical architecture　
developing a modular block diagram　
characterizing network addressing and naming　
characterizing wiring and media　
checking architectural and environmental constraints　
checking a site for a wireless installation　
performing a wireless site survey　
checking the health of the existing internetwork　
developing a baseline of network performance　
analyzing network availability　
analyzing network utilization　
measuring bandwidth utilization by protocol　
analyzing network accuracy　
analyzing errors on switched ethernet networks　
analyzing network efficiency　
analyzing delay and response time　
checking the status of major routers, switches, and
firewalls　
network health checklist　
summary　
review questions　
hands-on project　
design scenario　
chapter 　characterizing network traffic　
characterizing traffic flow　
identifying major traffic sources and stores　
documenting traffic flow on the existing network　
characterizing types of traffic flow for new network
applications　
terminal/host traffic flow　
client/server traffic flow　
peer-to-peer traffic flow　
server/server traffic flow　
distributed computing traffic flow　
traffic flow in voice over ip networks　
documenting traffic flow for new and existing network
applications　
characterizing traffic load　
calculating theoretical traffic load　
documenting application-usage patterns　
refining estimates of traffic load caused by applications　
estimating traffic load caused by routing protocols　
characterizing traffic behavior　
broadcast/multicast behavior　
network efficiency　
frame size　
windowing and flow control　
error-recovery mechanisms　
characterizing quality of service requirements　
atm qos specifications　
constant bit rate service category　
real-time variable bit rate service category　
non-real-time variable bit rate service category　
unspecified bit rate service category　
available bit rate service category　
guaranteed frame rate service category　
ietf integrated services working group qos specifications　
controlled-load service　
guaranteed service　
ietf differentiated services working group qos
specifications　
grade of service requirements for voice applications　
documenting qos requirements　
network traffic checklist　
summary　
review questions　
design scenario　
summary for part i　
part ii　logical network design　
chapter 　designing a network topology　
hierarchical network design　
why use a hierarchical network design model?　
flat versus hierarchical topologies　
flat wan topologies　
flat lan topologies　
mesh versus hierarchical-mesh topologies　
classic three-layer hierarchical model　
core layer　
distribution layer　
access layer　
guidelines for hierarchical network design　
redundant network design topologies　
backup paths　
load sharing　
modular network design　
cisco safe security reference architecture　
designing a campus network design topology　
spanning tree protocol　
spanning tree cost values　
rapid spanning tree protocol　
rstp convergence and reconvergence　
selecting the root bridge　
scaling the spanning tree protocol　
virtual lans　
fundamental vlan designs　
wireless lans　
positioning an access point for maximum coverage　
wlans and vlans　
redundant wireless access points　
redundancy and load sharing in wired lans　
server redundancy　
workstation-to-router redundancy　
hot standby router protocol　
gateway load balancing protocol　
designing the enterprise edge topology　
redundant wan segments　
circuit diversity　
multihoming the internet connection　
virtual private networking　
site-to-site vpns　
remote-access vpns　
service provider edge　
secure network design topologies　
planning for physical security　
meeting security goals with firewall topologies　
summary　
review questions　
design scenario　
chapter 　designing models for addressing and numbering　
guidelines for assigning network layer addresses　
using a structured model for network layer addressing　
administering addresses by a central authority　
distributing authority for addressing　
using dynamic addressing for end systems　
ip dynamic addressing　
ip version dynamic addressing　
zero configuration networking　
using private addresses in an ip environment　
caveats with private addressing　
network address translation　
using a hierarchical model for assigning addresses　
why use a hierarchical model for addressing and routing?　
hierarchical routing　
classless interdomain routing　
classless routing versus classful routing　
route summarization (aggregation)　
route summarization example　
route summarization tips　
discontiguous subnets　
mobile hosts　
variable-length subnet masking　
hierarchy in ip version addresses　
link-local addresses　
global unicast addresses　
ipv addresses with embedded ipv addresses　
designing a model for naming　
distributing authority for naming　
guidelines for assigning names　
assigning names in a netbios environment　
assigning names in an ip environment　
the domain name system　
dynamic dns names　
ipv name resolution　
summary　
review questions　
design scenario　
chapter 　selecting switching and routing protocols　
making decisions as part of the top-down network design
process　
selecting switching protocols　
switching and the osi layers　
transparent bridging　
selecting spanning tree protocol enhancements　
portfast　
uplinkfast and backbonefast　
unidirectional link detection　
loopguard　
protocols for transporting vlan information　
ieee .q　
dynamic trunk protocol　
vlan trunking protocol　
selecting routing protocols　
characterizing routing protocols　
distance-vector routing protocols　
link-state routing protocols　
routing protocol metrics　
hierarchical versus nonhierarchical routing protocols　
interior versus exterior routing protocols　
classful versus classless routing protocols　
dynamic versus static and default routing　
on-demand routing　
scalability constraints for routing protocols　
routing protocol convergence　
ip routing　
routing information protocol　
enhanced interior gateway routing protocol　
open shortest path first　
intermediate system-to-intermediate system　
border gateway protocol　
using multiple routing protocols in an internetwork　
routing protocols and the hierarchical design model　
redistribution between routing protocols　
integrated routing and bridging　
a summary of routing protocols　
summary　
review questions　
design scenario　
chapter 　developing network security strategies　
network security design　
identifying network assets　
analyzing security risks　
analyzing security requirements and tradeoffs　
developing a security plan　
developing a security policy　
components of a security policy　
developing security procedures　
maintaining security　
security mechanisms　
physical security　
authentication　
authorization　
accounting (auditing)　
data encryption　
public/private key encryption　
packet filters　
firewalls　
intrusion detection and prevention systems　
modularizing security design　
securing internet connections　
securing public servers　
securing e-commerce servers　
securing remote-access and vpns　
securing remote-access technologies　
securing vpns　
securing network services and network management　
securing server farms　
securing user services　
securing wireless networks　
authentication in wireless networks　
data privacy in wireless networks　
summary　
review questions　
design scenario　
chapter 　developing network management strategies　
network management design　
proactive network management　
network management processes　
fault management　
configuration management　
accounting management　
performance management　
security management　
network management architectures　
in-band versus out-of-band monitoring　
centralized versus distributed monitoring　
selecting network management tools and protocols　
selecting tools for network management　
simple network management protocol　
management information bases (mib)　
remote monitoring (rmon)　
cisco discovery protocol　
cisco netflow accounting　
estimating network traffic caused by network management　
summary　
review questions　
design scenario　
summary for part ii　
part iii　physical network design　
chapter 　selecting technologies and devices for campus
networks　
lan cabling plant design　
cabling topologies　
building-cabling topologies　
campus-cabling topologies　
types of cables　
lan technologies　
ethernet basics　
ethernet and ieee .　
ethernet technology choices　
half-duplex and full-duplex ethernet　
-mbps ethernet　
gigabit ethernet　
-gbps ethernet　
selecting internetworking devices for a campus network
design　
criteria for selecting campus internetworking devices　
optimization features on campus internetworking devices　
example of a campus network design　
background information for the campus network design project　
business goals　
technical goals　
network applications　
user communities　
data stores (servers)　
current network at wvcc　
traffic characteristics of network applications　
summary of traffic flows　
performance characteristics of the current network　
network redesign for wvcc　
optimized ip addressing and routing for the campus backbone　
wireless network　
improved performance and security for the edge of the
network　
summary　
review questions　
design scenario　
chapter 　selecting technologies and devices for enterprise
networks　
remote-access technologies　
ppp　
multilink ppp and multichassis multilink ppp　
password authentication protocol and challenge handshake
authentication protocol　
cable modem remote access　
challenges associated with cable modem systems　
digital subscriber line remote access　
other dsl implementations　
ppp and adsl　
selecting remote-access devices for an enterprise
network design　
selecting devices for remote users　
selecting devices for the central site　
wan technologies　
systems for provisioning wan bandwidth　
leased lines　
synchronous optical network　
frame relay　
frame relay hub-and-spoke topologies and subinterfaces　
frame relay congestion control mechanisms　
frame relay traffic control　
frame relay/atm interworking　
atm　
ethernet over atm　
metro ethernet　
selecting routers for an enterprise wan design　
selecting a wan service provider　
example of a wan design　
background information for the wan design project　
business and technical goals　
network applications　
user communities　
data stores (servers)　
current network　
traffic characteristics of the existing wan　
wan design for klamath paper products　
summary　
review questions　
design scenario　
summary for part iii　
part iv　testing, optimizing, and documenting your network
design　
chapter 　testing your network design　
using industry tests　
building and testing a prototype network system　
determining the scope of a prototype system　
testing a prototype on a production network　
writing and implementing a test plan for your network design　
developing test objectives and acceptance criteria　
determining the types of tests to run　
documenting network equipment and other resources　
writing test scripts　
documenting the project timeline　
implementing the test plan　
tools for testing a network design　
types of tools　
examples of network testing tools　
ciscoworks internetwork performance monitor　
wandl network planning and analysis tools　
opnet technologies　
ixia tools　
netiq voice and video management solution　
netpredict’s netpredictor　
summary　
review questions　
design scenario　
chapter 　optimizing your network design　
optimizing bandwidth usage with ip multicast technologies　
ip multicast addressing　
internet group management protocol　
multicast routing protocols　
distance vector multicast routing protocol　
protocol independent multicast　
reducing serialization delay　
link-layer fragmentation and interleaving　
compressed real-time transport protocol　
optimizing network performance to meet quality of service
requirements　
ip precedence and type of service　
ip differentiated services field　
resource reservation protocol　
common open policy service protocol　
classifying lan traffic　
cisco ios features for optimizing network performance　
switching techniques　
classic methods for layer packet switching　
netflow switching　
cisco express forwarding　
queuing services　
first-in, first-out queuing　
priority queuing　
custom queuing　
weighted fair queuing　
class-based weighted fair queuing　
low-latency queuing　
random early detection　
weighted random early detection　
traffic shaping　
committed access rate　
summary　
review questions　
design scenario　
chapter 　documenting your network design　
responding to a customer’s request for proposal　
contents of a network design document　
executive summary　
project goal　
project scope　
design requirements　
business goals　
technical goals　
user communities and data stores　
network applications　
current state of the network　
logical design　
physical design　
results of network design testing　
implementation plan　
project schedule　
project budget　
return on investment　
design document appendix　
summary　
review questions　
design scenario　
glossary　
index

章節(jié)摘錄

版權(quán)頁(yè)：插圖：One advantage of private network numbers is security.Private network numbers are notadvertised to the Internet.Private network numbers musf not be advertised to theInternet because they are not globally unique.By not advertising private internal networknumbers，a modicum of security iS achieved.Additional security,including firewalls andintrusion detection systems，should also be deployed，as discussed in Chapter 5，“Designing a Network Topology,”and Chapter 8.Developing Network SecurityStrategies.Private addressing also helps meet goals for adaptability and flexibility.Using privateaddressing makes it easier to change ISPs in the future.If private addressing has beenused，when moving to a new ISP,the only address changes required are in the router orfirewall providing NAT services and in any public servers.You should recommend privateaddressing to customers who want the flexibility of easily switching to a different ISP inthe future.Another advantage of private network numbers iS that an enterprise network can advet-tise iust one network number,or a small block of network numbers，to the Internet.It iSgood practice to avoid advertising many network numbers to the Internet.One of thegoals of modern Internet practices iS that Internet routers should not need to managehuge routing tables.As an enterprise network grows，the network manager can assign pri-vate addresses to new networks，rather than requesting additional public network num。bers from an ISP or RIR.This avoids increasing the size of Internet routing tables.Private network numbers let a network designer reserve scarce Internet addresses forpublic servers.During the mid一1990s，as the Internet became commercialized and popu-larized，a scare rippled through the Internet community about the shortage of addresses.Dire predictions were made that no more addresses would be available by the turn of thecentury.Because of this scare，many companies（and many ISPs）were given a small set ofaddresses that needed to be carefully managed to avoid depletion.These companies rec.ognize the value of orivate addresses for internal networks.

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