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Implementing Secure Converged Wide
Area Networks (642-825 ISCW)
Take-Aways
Course 1: Cable (HFC) Technologies
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Course 1 Take-Away
Cable (HFC) Technologies
Despite Cable Hybrid Fiber Coax (HFC) limitations
associated with Data Over Cable Service Interface
Specifications (DOCSIS) data transmission, HFC cabling
and networking concepts are a viable data medium to data
and voice distribution systems.
DOCSIS
The DOCSIS standard for data transport over Cable
Television System (CATV) mandates that the DOCSIS
system provide > 99% availability when forwarding 1500byte packets at the rate of at least 100 packets per second.
To do so, DOCSIS has set CATV upstream/downstream
performance specifications.
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Course 1 Take-Away
(continued)
Digital Subscriber Line (DSL) Technologies
A modern technology, xDSL uses existing twisted
pair, plain old telephone system (POTS) lines to
transport high-bandwidth data, such as multimedia
and video, to service subscribers. xDSL refers to the
family of DSL types: ADSL, SDSL, HDSL, RADSL,
and VDSL.
The primary components of DSL are are a
telecommunications office and customer premises
equipment (CPE) devices.
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Course 1 Take-Away
(continued)
Cable Modems
Cable modems primarily deliver broadband Internet
access in the form of cable Internet. Cable modems
also utilize unused bandwidth on a cable television
network. Cable modem services require access to two
protocols: TFTP (Trivial File Transfer Protocol) and
DHCP (Dynamic Host Configuration Protocol).
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Course 1 Take-Away
(continued)
MPLS
Cisco’s Multi-protocol Label-Switching (MPLS)
enables organizations and Service Providers to build
next-generation intelligent networks that deliver a
wide variety of advanced, value-added services over a
single infrastructure. MPLS can be integrated over
existing infrastructures such as IP, Frame Relay,
ATM, and Ethernet. As well, MPLS application
components can be integrated with Layer 3 virtual
private networks (VPNs), Layer 2 VPNs, Traffic
Engineering, quality of service (QoS), and IPV6, for
highly secure and scalable networks.
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Course 1 Take-Away
(continued)
Frame-Mode MPLS
Frame-Mode MPLS requires that the Cisco router
have Cisco Express Forwarding (or, CEF) Switching
enabled—whether globally, or for individual
interfaces. To enable CEF switching globally is to
enable CEF switching on all interfaces.
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(continued)
Basic Cisco Teleworker Services include:
•High-speed Internet connections to the home
•VPN-cable routers
•Terminal emulation
•Laptops as portable PCs
•GroupWare
•VoIP
Teleworker Services substitute work-in-the-workplace for
telecommuting or remote access networking.
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Course 1 Take-Away
(continued)
IPsec (IP security)
is a suite of protocols for securing Internet Protocol
(IP) communications through the
authentication/encryption of each IP packet in a data
stream
VPNs
A virtual private network (VPN) is a communications
network that is tunneled through another network, and
dedicated for a specific network use.
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Course 1 Take-Away
(continued)
SDM
The Cisco Router and Security Device Manager
(SDM) supports a wide range of Cisco IOS Software
releases and is available free of charge on various
Cisco router models. SDM offers smart wizards and
advanced configuration support for LAN and WAN
interfaces, Network Address Translation (NAT),
stateful and application firewall policy, IPS, IPSec
VPN, QoS, and NAC policy features. Its primary
purpose to to deploy firewall security features.
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Course 1 Take-Away
(continued)
AAA
Authentication, Authorization, and Accounting
(AAA) is a framework for controlling access to IT
resources. AAA enforces policies, audits usage, and
provides information that is necessary to bill for
services. AAA results in effective network
management and security
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