Summary
CCNA 4 Chapter summary - personal notes
- Module
- Networking
- Institution
- Birmingham City University (BCU)
Summary of 27 pages for the course Networking at BCU
[Show more]
Seller
Follow
Content preview
CH1 - Introduction to WANs A WAN is a data communications network that operates beyond the geographic scope of a
LAN.
As companies grow, adding more employees, opening branch offices, and expanding into
global markets, their requirements for integrated services change. These business
requirements drive their network requirements.
The Cisco Enterprise Architecture expands upon the Hierarchical Design Model by further
dividing the enterprise network into physical, logical, and functional areas.
Implementation of a Cisco Enterprise Architecture provides a secure, robust network with
high availability that facilitates the deployment of converged networks.
WANs operate in relation to the OSI reference model, primarily on Layer 1 and Layer 2.
Devices that put data on the local loop are called data circuit-terminating equipment, or
data communications equipment (DCE). The customer devices that pass the data to the DCE
are called data terminal equipment (DTE). The DCE primarily provides an interface for the
DTE into the communication link on the WAN cloud.
The physical demarcation point is the place where the responsibility for the connection
changes from the enterprise to the service provider.
Data Link layer protocols define how data is encapsulated for transmission to remote sites
and the mechanisms for transferring the resulting frames.
A circuit-switching network establishes a dedicated circuit (or channel) between nodes and
terminals before the users may communicate.
A packet-switching network splits traffic data into packets that are routed over a shared
network. Packet-switching networks do not require a circuit to be established and allow
many pairs of nodes to communicate over the same channel.
A point-to-point link provides a pre-established WAN communications path from the
customer premises through the provider network to a remote destination. Point-to-point
links use leased lines to provide a dedicated connection.
Circuit-switching WAN options include analog dialup and ISDN. Packet-switching WAN
options include X.25, Frame Relay, and ATM. ATM transmits data in 53-byte cells rather than
frames. ATM is most suited to video traffic.
Internet WAN connection options include broadband services, such as DSL, cable modem or
broadband wireless, and Metro Ethernet. VPN technology enables businesses to provide
secure teleworker access through the Internet over broadband services.
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller MAEBCU. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.99. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
75632 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now