(OLD) €h 17 Data Network Design Flashcards
17–2 network design
Physical design =
Bottom-up design
17-1 network design
Functional design =
Top-down design
17–3 networking history
1970s =
Ethernet is developed
17–5
OSI =
Open systems interconnection
17–5 OSI
ISO =
2
International organization for standardization
1978
17-5 OSI
objective OSI model =
Structured approach
17–5 OSI
OSI model =
2
Seven layers
Layer above
17–6 OSI
Layers OSI model =
Protocol stack
17–6 OSI
Protocol stack =
3
- Services
- lower layers to upper layers
- SAP’s connection point between layers
17–8 layers
7 layers =
All People Seem To Need Domino's Pizza
17–8 layers
All people seem to need dominos pizza =
A= 7 Application P= 6 presentation S= 5 session T= 4 transport N= 3 network D= 2 datalink P= 1physical
17–8 layers
Layer 7 application =
Applications
file transfer
17–8 layers
Layer 6 presentation =
Encryption
17–8 players
Layer 5 session =
Synchronizing
start, stop, restart
17–8 layers
Layer 4 transport =
Transfer
process
billing
quality
17–8 layers
Layer 3 network =
Internetwork data transfer
route
17–8 layers
Layer 2 datalink =
Intra-network
between devices
17–8 layers
Layer 1 physical=
Over various media
17–11 types of networks
PAN =
3
Personal area network
individual workspace
33 ft
17–12 types of networks
LAN =
2
Local area network
within a building
17–13 types of networks
CAN =
2
Campus area network
two or more buildings
17–14 types of networks
MAN =
2
Metropolitan area network
within a city
17–15 types of networks
WAN =
2
Wide area network
geographic distances
17–16 Ethernet in the first mile
EFM =
IEEE 802.3ah
17–16 EFM
LOOP DISTANCE =
20,000 feet
17–25 EFM cabling transmission characteristics
DWDM/NZDSF =
Submarine
17–26 types of messaging
Unicast =
broadcast =
multicast =
One receptionist
all devices
select group
17–36 types of addressing
Octet =
Mac addresses =
Network addresses =
8 bits
48 bits
32 bits
17–41 network architecture standards
802.11 =
Wireless
Hint: two towers = 11
17–41 network architecture standards
- 5 =
Token ring
Hint: “FIVE TOKEN RINGS!!!”
17–41 network architecture standards
802.6 =
MAN
HINT: 6 the man
17–41 network architecture standards
802.7 =
Broadband
17–41 network architecture standards
802.8 =
Fiber optic
17–46 stations
NIC=
Station to the network
17–46 stations
Improve performance =
Traffic prioritization
17–47 stations
Hub a NIC =
Half duplex mode
17–51 servers
Rack unit =
RU, 1RU
17–52 servers
42U =
Contains 168 servers
17–54 servers
Link aggregation =
2
Multiple NICs
Upgrade server resources incrementally
17–54 servers
Hot swap =
Replacement
server and NIC
powering down
17–55 servers
Clustering =
Two or more servers
17–56 shared peripherals
Print servers =
Spooling
17–60 data network design
Hub =
Centralized point
17–60 data network design
Before the introduction of hubs =
LAN
17–62 hubs
Hub =
Layer one physical
17–64
Q: with an older system which is periodically slowing down and consists of layer 2 switches, what can be done to speed up the system?
Install bridges
17–67
Bridges =
Layer 2 datalink
17–68 switches
Switches =
Network access device
17–68 switches
Port on a hub =
Port on a switch =
- Shared connection
* dedicated connection
17-69 switches
Switch =
Layer 2 data link
17-72 routers
Router =
2
- Hardware and software, specialized devices
* Multiple broadcast domains/subnet
17–88 voice communications
G.711 =
Converting speech
17–88 voice communications
IEEE 802.1p
Prioritization
17–94 video communications
Videoconferencing =
Most demanding resource
17–95 voice communications
Gateway =
gatekeeper =
Multipoint control unit MCU =
- Communications
- operations
- videoconference sessions
