Horus CCENT study guide I hope this is useful -
horusthesun
Member Posts: 289
in CCNA & CCENT
CCNA Study Guide
Book 1
TCP/IP
Application: HTTP, POP3, SMTP-Provides services to the applications running on a computer.
Transport: TCP, UDP-Controls QoS. Uses segments.
Internet: IP- IP addressing. Uses Packets
Network: Ethernet, Frame Relay- Routing and physical protocol standards (Physical and DataLink). Uses Frames.
OSI
Application- Interface between Network and Applications. Includes Authentication
Presentation- Defines format and organization. Includes encryption
Session- Establishes and maintains end to end bidirectional flows. Includes transaction flows.
Transport- Provides many services between two host computers such as connection establishment and termination, flow control, error recovery and segmentation of large data blocks.
Networking- Logical addressing and routing.
Data-link- Formats data into frames. Defines rules for when medium should be used. Defines means of which to recognize transmission errors. Switches work on this layer.
Physical- Physical specifications, such as voltage, frequency, optical and connectors. Hubs and switches work on this layer.
LAN
CSMA/DC- Detects and “repairs” collisions by stopping communications when one occurs.
Ethernet 10 10Base-T 802.3 100m Copper
Fast Ethernet 100 100Base-TX 802.3u 100m Copper
Gigabit 1000 1000BaseLX 802.3z 5km(LX) Fiber 550m (SX) Fiber
Gigabit 1000 1000Base-T 802.3ab 100m Copper
CSMA/DC Steps
1. A device with a packet to send waits until Ethernet is silent
2. When silent, sender(s) begins to send frames
3. Sender(s) listen to see if there is a collision
4. If so, sending devices send a jamming signal to say there was one
5. Once jamming is complete, each sender randomizes a timer and waits to resend
6. When timer is up, process starts all over
WAN Layer 1
CSU- Chanel Service Unit- Interface to Telco lines, connected to router with short cable
DSU- Data Service Unit- Interface to Telco lines, connected to router with short cable
CPE- Customer Premises Equipment
DCE- Data Communications Equipment (Sends Clocking)
DTE- Data Terminal Equipment (receives Clocking)
PCM- Pulse Code Modulation- ADC
TMD- Time Division Multiplexing- Combining slow lines to make a fast one
60 pin D-Shell cable goes to router
CSU/DSU gets: EIA/TIA-232, EIA/TIA-449, V.35, x.21, EIA-530
CSU/DSU to Telco gets RJ-48
WAN Layer 2
HDLC-High-level Data-Link Control- Data-Link layer protocol for point to point links
PPP- Point to Point Protocol- Data-Link layer protocol for point to point links
DLCI- Data-Link connection identifier- Header that holds an address
Packet Switching- Allows one router and CSU/DSU to connect to several (100+) branch sites
Frame Relay- Multicast, Telco examines packets, AKA Frame switching
DCE- Frame Relay switches
TDET- Routers/Customer equipment
PVC- Permanent Virtual Circuit
CIR- Committed Information Rate
Leased Lines: AKA: leased circuit, link, serial link, serial line, point-to-point link, circuit pointto-point WAN- Acts like a direct circuit between two sites, acts like a set of two twisted pairs of wires.
Standard HDLC Frame
| 1 | 1 | 1 | Variable | 4 |
| Flag | Address | Control | Data | FCS |
CISCO HDLC Frame
| 1 | 1 | 1 | 2 | Variable | 4 |
|Flag | Aggress | Control | Type | Data | FCS |
More to come need to reformat data copy pasta isn't working .... no word wrap
fixing wall of text
Book 1
TCP/IP
Application: HTTP, POP3, SMTP-Provides services to the applications running on a computer.
Transport: TCP, UDP-Controls QoS. Uses segments.
Internet: IP- IP addressing. Uses Packets
Network: Ethernet, Frame Relay- Routing and physical protocol standards (Physical and DataLink). Uses Frames.
OSI
Application- Interface between Network and Applications. Includes Authentication
Presentation- Defines format and organization. Includes encryption
Session- Establishes and maintains end to end bidirectional flows. Includes transaction flows.
Transport- Provides many services between two host computers such as connection establishment and termination, flow control, error recovery and segmentation of large data blocks.
Networking- Logical addressing and routing.
Data-link- Formats data into frames. Defines rules for when medium should be used. Defines means of which to recognize transmission errors. Switches work on this layer.
Physical- Physical specifications, such as voltage, frequency, optical and connectors. Hubs and switches work on this layer.
LAN
CSMA/DC- Detects and “repairs” collisions by stopping communications when one occurs.
Ethernet 10 10Base-T 802.3 100m Copper
Fast Ethernet 100 100Base-TX 802.3u 100m Copper
Gigabit 1000 1000BaseLX 802.3z 5km(LX) Fiber 550m (SX) Fiber
Gigabit 1000 1000Base-T 802.3ab 100m Copper
CSMA/DC Steps
1. A device with a packet to send waits until Ethernet is silent
2. When silent, sender(s) begins to send frames
3. Sender(s) listen to see if there is a collision
4. If so, sending devices send a jamming signal to say there was one
5. Once jamming is complete, each sender randomizes a timer and waits to resend
6. When timer is up, process starts all over
WAN Layer 1
CSU- Chanel Service Unit- Interface to Telco lines, connected to router with short cable
DSU- Data Service Unit- Interface to Telco lines, connected to router with short cable
CPE- Customer Premises Equipment
DCE- Data Communications Equipment (Sends Clocking)
DTE- Data Terminal Equipment (receives Clocking)
PCM- Pulse Code Modulation- ADC
TMD- Time Division Multiplexing- Combining slow lines to make a fast one
60 pin D-Shell cable goes to router
CSU/DSU gets: EIA/TIA-232, EIA/TIA-449, V.35, x.21, EIA-530
CSU/DSU to Telco gets RJ-48
WAN Layer 2
HDLC-High-level Data-Link Control- Data-Link layer protocol for point to point links
PPP- Point to Point Protocol- Data-Link layer protocol for point to point links
DLCI- Data-Link connection identifier- Header that holds an address
Packet Switching- Allows one router and CSU/DSU to connect to several (100+) branch sites
Frame Relay- Multicast, Telco examines packets, AKA Frame switching
DCE- Frame Relay switches
TDET- Routers/Customer equipment
PVC- Permanent Virtual Circuit
CIR- Committed Information Rate
Leased Lines: AKA: leased circuit, link, serial link, serial line, point-to-point link, circuit pointto-point WAN- Acts like a direct circuit between two sites, acts like a set of two twisted pairs of wires.
Standard HDLC Frame
| 1 | 1 | 1 | Variable | 4 |
| Flag | Address | Control | Data | FCS |
CISCO HDLC Frame
| 1 | 1 | 1 | 2 | Variable | 4 |
|Flag | Aggress | Control | Type | Data | FCS |
More to come need to reformat data copy pasta isn't working .... no word wrap
fixing wall of text
Comments
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pamccabe
Member Posts: 315 ■■■□□□□□□□
Holy crap. Huge wall of text hits you for 900000393929929 damage! -
horusthesun
Member Posts: 289
Sorry I don't know why ..... I will copy and paste from works to word pad and see what happens !!
