WAN Overview
WAN Defined
Cost and Usage
WAN Connection Modules
WAN Interconnections
WAN Transport Technologies
WAN Comparison
WAN Design Methodology
By PPDIOO;
Analyzing the network requirements
Characterizing the existing network
Designing the topology
Application Requirements
Response Time - Response time measures the time between the
client user request and the response from the server host.
Throughput - In network communications, throughput is the
measure of data transferred from one host to another in a given amount of time.
Reliability - Reliability is the measure of a given
application’s availability to its users.
Bandwidth Considerations:
Copper
Fiber
Wireless
WAN Link Categories:
Private
Leased
Shared
Optimizing Bandwidth Using QoS
Queuing, Traffic
Shaping, and Policing
Classification - Identifies and
marks flow and provides priority to certain flows:
NBAR
- Network-Based Application Recognition
CAR
- Committed access rate
Congestion management - Mechanism
to handle traffic overflow using a queuing algorithm:
The hardware queue uses the
strategy of first in, first out (FIFO). The software queue schedules packets
first and then places them in the hardware queue. Keep in mind that the
software queue is used only during periods of congestion. The software queue uses
QoS techniques such as priority queuing, custom queuing, weighted fair queuing,
class-based weighted fair queuing, low-latency queuing, and traffic shaping and
policing.
Link-efficiency mechanisms - Reduce
latency and jitter for network traffic on low-speed links:
Link fragmentation and
interleaving (LFI), Multilink PPP (MLP), and Real-Time Transport Protocol (RTP)
header compression provide for more efficient use of available bandwidth.
Traffic shaping and policing - Avoids
congestion by policing ingress and egress flows:
Traffic shaping and policing are
mechanisms that inspect traffic and take an action based on the traffic’s
characteristics, such as DSCP or IP precedence its set in the IP header.
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