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86 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Layer 1 |
Physical layer - physical network media and signal methods -bits
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Anything you can touch |
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Layer 2 |
Data link -provides error free transfer of data frames -frames |
DLL- data link layer -any device that makes a physical connection to a network and has the ability to move data |
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Layer 3 |
Network - manages data routing and creating sub networks - packets - |
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Layer 4 |
Transport -manages message fragmentation and reassembly -segment -Manages transmission of messages between layers 1-3 |
Ports -showing connections in command prompt and describing ports |
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Layer 5 |
Session - establishes a communication session between devices - controls name and address database for OS & NOS. |
Logging in and out |
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Layer 6 |
Presentation. - translates data into common format |
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Layer 7 |
Application - enables users and applications to access network services |
Message (packet) creation |
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L1 components |
Back (Definition) Cables, punch blocks, hubs, MAUs -concepts: analog/digital encoding. But synchronization. Baseband versus broadband. Serial data transfer. Topologies |
"Sdt" |
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Broadband |
-multiple channels that can be utilized by the communication system. |
Converse to baseband -like FM radio stations and cable tv |
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L2 switch |
Most common type of switch used on LAN. - hardware based - use MAC addresss to direct frames - each port on switch is its on segment and has its own bandwithb |
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CAM (table) |
Content addressable memory - memory set aside to store the MAC address to port translation table |
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MAC flood attack * |
Send numerous packets to the switch to attempt to use up all the memory. -causes failopen mode, bandwidth dramatically reduced and articles can access data on any other comp on the net |
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ICMP |
Internet control message protocol -L3 - sends test messages to other comps |
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ARP (table) |
Address resolution protocol -L3 - resolves/ translates IP addresses to MAC address, allowing connectivity between the L3 to L2 |
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Encapsulation. |
-adding additional bytes onto a packet - |
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L3 Overhead |
-additional 28 bytes added onto a packet to create a frame Two parts: 1. Header. 20 bytes which include IP source and destination address 2. 8 for additional info |
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L2 overhead |
14 bytes. -include source and destination MAC address |
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L3 switch |
Determines path for IP address -forward packets Manages utilizing SNMP tool amongst others |
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L2 components |
-network interface cards, wireless access points, and bridges -uses physical address (MAC Addresses ) which are burned into NIC or ROM. -l2 switching allows for VLANs |
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SNMP |
Simple network management protocol. -allows analyzation of packets that pass through switch. |
Like a router -watches traffic -manages what L3 sends |
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Lower OSI layers |
1-3 |
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Upper OSI layers |
4-7 |
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TCP |
Transfer control protocol -connection orientated |
Web browser |
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Inbound ports |
Used to accept incoming connections and serve data |
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Outbound |
- to connect to a service or app running on another computer. |
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TCP Model app layer |
-defines TCP/IP application protocols |
HTTP, telnet, FTP, SMNP, DNS |
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TCP Model transport layer |
Provides communication session management |
TCP,UDP, RTP |
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TCP Model Internet layer |
Packages and routes data |
IP, ICMP,ARP, RARP |
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L3 components |
-routers and IP switches. - use of logical addresses (IP) -ICMP -ARP |
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TCP Model network interface |
Details how data is physically sent through the network |
Ethernet, token ring, frame relay. |
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L4 components |
-ports -TCP -UDP |
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L5 components |
-NetBIOS |
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L6 concepts |
-code conversion, data compression, file encryption. -redirectors work on this layer |
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L7 components |
-FTP, SMTP, telnet, RAS -not the app itself, but the PROTOCOLS initiated by this layer -gateways |
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Communication subnetwork |
- layers 1-3. |
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MAC Address |
"Media access control " Six octets in length and written in hexidecimal |
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Baseband |
All computers on a LAN sharing the same chanel or frequency to transmit data |
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Broadband |
-multiple channels that can be utilized by the communication system. |
Converse to baseband -like FM radio stations and cable tv |
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L2 components |
-network interface cards, wireless access points, and bridges -uses physical address (MAC Addresses ) which are burned into NIC or ROM. -L2 switching allows for VLANs |
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UDP |
User datagram protocol -connectionless |
Streaming media |
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Wireshark |
Program used for packet capture |
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FTP |
File transfer protocol - port 21 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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SMTP |
Simple mail transfer protocol -port 25 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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SMTP |
Simple mail transfer protocol -port 25 |
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DNS |
Domain name system -port 53 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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SMTP |
Simple mail transfer protocol -port 25 |
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DNS |
Domain name system -port 53 |
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HTTP |
Hypertext transfer Protocol -port 80 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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SMTP |
Simple mail transfer protocol -port 25 |
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DNS |
Domain name system -port 53 |
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HTTP |
Hypertext transfer Protocol -port 80 |
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NetBIOS |
Name, datagram, and session services -ports 137-139 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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SMTP |
Simple mail transfer protocol -port 25 |
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DNS |
Domain name system -port 53 |
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HTTP |
Hypertext transfer Protocol -port 80 |
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NetBIOS |
Name, datagram, and session services -ports 137-139 |
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SNMP |
Simple network management protocol -port 161 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
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SMTP |
Simple mail transfer protocol -port 25 |
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DNS |
Domain name system -port 53 |
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HTTP |
Hypertext transfer Protocol -port 80 |
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NetBIOS |
Name, datagram, and session services -ports 137-139 |
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SNMP |
Simple network management protocol -port 161 |
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HTTPS |
Hypertext transfer protocol secure - port 443 |
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FTP |
File transfer protocol - port 21 |
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Telnet |
Terminal network -port 23 |
+ ter****l |
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SMTP |
Simple mail transfer protocol -port 25 |
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DNS |
Domain name system -port 53 |
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HTTP |
Hypertext transfer Protocol -port 80 |
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NetBIOS |
Name, datagram, and session services -ports 137-139 |
+ Ndss |
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SNMP |
Simple network management protocol -port 161 |
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HTTPS |
Hypertext transfer protocol secure - port 443 |
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RDP |
Remote Desktop protocol -port 3389 |
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