CIS 505 Week 5 Discussions STR
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CIS 505 Week 5 Discussions STR
CIS 505 Week 5 Discussion 1
Routing and Switching Selection Criteria. Please respond
to the following:
Compare distance-vector and link state routing and
analyze the limitations that would prevent the usage of each.
Distance vector routing protocols are
designed to run on small networks (usually fewer than 100 routers). Examples of
distance vector routing protocols include RIP and IGRP. Distance vector
protocols are generally easier to configure and require less maintenance than
link-state protocols. On the downside, distance vector protocols do not scale
well because they require higher CPU and bandwidth utilization. They also take
longer to converge than do link-state protocols. Distance vector protocols
always choose the route with the fewest number of hops as the best route. This
can be a problem when the best route to a destination is not the route with the
least number of hops.
Link state routing protocols are designed to
operate in large, enterprise-level networks. Examples of link state protocols
include OSPF and NLSP. Link state routing protocols are very complex and are
much more difficult to configure, maintain, and troubleshoot than distance
vector routing protocols. Additionally, link state convergence occurs faster
than distance vector convergence. This is because link state establishes a
neighbor relationship with directly connected peers and shares routing
information with its neighbors only when there are changes in the network
topology. Link state routing protocols can be difficult to configure and
maintain.
Choose the method best suited for designing a new routing
protocol for a LAN architecture. Justify your decision.
The best method for designing a new routing
protocol for a LAN is employ two or three tiers of LANs. Within a department, a
low-cost, moderate speed LAN supports a cluster of personal computers and
workstations. These departmental LANs are lashed together with a backbone LAN
of higher capacity. The architecture of a LAN is best described in terms of a
layering of protocols that organize the basic functions of a LAN.
CIS 505 Week 5 Discussion 2
Suggest a way to improve the way LLC and MAC are used for
LAN operation.
The MAC layer is responsible for detecting
errors and discarding any frames that contain errors. The LLC layer optionally
keeps track of which frames have been successfully received and retransmits
unsuccessful frames. The relationship between LLC and the MAC protocol can be
seen by considering the transmission formats involved. User data are passed
down to the LLC layer, which prepares a link-level frame, known as an LLC
protocol data unit (PDU). This PDU is then passed down to the MAC layer where
it is enclosed in a MAC frame. In a wireless environment, data packets may be
lost entirely, partially lost due to truncation, or corrupted by bit errors.
However, adaptive packet shrinking and forward error correction (FEC) policies
significantly increase the useful throughput of a wireless LAN, while the fixed
policies are effective only in some environments & can be added fairly
easily to the MAC and LLC implementations.
Stallings, William. (10/2008). Business Data
Communications, 6th Edition. [VitalSource Bookshelf Online]. Retrieved
from https://strayer.vitalsource.com/#/books/9781323079324/
Eckhardt, D. A., & Steenkiste, P. (1998, October).
Improving Wireless LAN Performance via Adaptive Local Error Control. Retrieved
from http://repository.cmu.edu/cgi/viewcontent.cgi?article=1526&context=compsci
Evaluate guided and unguided transmission medium to
determine which you would use to design a new facility.
Transmission media can be classified as a
guided or unguided. With guided media, the waves are guided along a solid
medium, such as copper twisted pair, copper coaxial cable, or optical fiber.
The atmosphere and outer space are examples of unguided media, which provide a
means of transmitting electromagnetic signals but do not guide them; this form
of transmission is usually referred to as wireless transmission. For a new
facility I would initially go with guided transmission media and then add
unguided transmission media. Guided transmission capacity depends on the
distance and on whether the medium is point-to-point or multipoint. Unguided
transmission and reception are achieved by means of an antenna, is directional
& puts out focused beam. However, the transmitter and receiver must be
aligned but can spread signals out in all directions & can also be received
by many antennas.
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