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53 Cards in this Set
- Front
- Back
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Wireless IEEE Standard 802.11
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Has many variations. Uses CSMA/CA. Commonly referred to as WiFi. (Up to 600mbps - 802.11n)
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Wireless IEEE Standard 802.15
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Supports speeds up to 3mbps. Device pairing up to 100m. Commonly known as Bluetooth.
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Wireless IEEE Standard 802.16
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Provides speeds up to 1Gbps. Has a point to multi-point topology.
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Three intermediary devices |
Switch, Router, WAP
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What is a switch?
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Intermediary device that connects multiple devices to a network. - Filters and forwards packets. |
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What is a router?
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Intermediary device that connects networks together and directs traffic. - Analyses packets. |
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What is a WAP?
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Intermediary device that wirelessly connects devices to a network.
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What would you use to configure a router locally? |
Console interface. Straight-through or rollover cable. Software: Teraterm. |
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What would you use to configure a router remotely?
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Gigabit Ethernet interface. Straight-through cable. Software: CMD or puTTy. |
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Configuring a switch: what command would you use for a console password? |
line console 0 password cisconpass |
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Configuring a switch: what command would you use to encrypt cleartext passwords? |
service password encryption
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What is layer 7 of the OSI model?
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Application: provides the interface to the network.
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What is layer 6 of the OSI model?
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Presentation: translates, compresses and encrypts/decrypts data.
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What is layer 5 of the OSI model?
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Session: creates and maintains dialog between source and destination applications.
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What is layer 4 of the OSI model?
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Transport: establishes a temporary communication session, and delivers data between two applications.
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What is layer 3 of the OSI model?
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Network: end-to-end addressing and path determination. (Router, IP addresses)
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What is layer 2 of the OSI model?
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Data link: responsible for the transfer of frames across the physical medium. (Switch, MAC addresses)
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What is layer 1 of the OSI model?
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Physical: Transmits and receives the unstructured raw bit stream. (Hub)
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What is the TCP/IP stack?
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4: Application 3: Transport 2: Internet 1: Network Access |
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When configuring a switch, what is the command for a vty password? |
switch# line vty 0 4 switch# pass cisvtypass |
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What are 5 application layer protocols?
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25: SMTP 80: HTTP 143: IMAP 69: TFTP 53: DNS ( S H I T - 'D ) |
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What is Port 143?
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IMAP: Internet Message Access Protocol. Mail retrieval and stores the mail on the server.
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What is Port 25?
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SMTP: Simple Mail Transfer Protocol. Used to transfer mail messages and attachments.
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What is Port 80?
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HTTP: Hyper-Text Transfer Protocol. Used to transfer files that make up webpages on the WWW.
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What is Port 69?
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TFTP: Trivial File Transfer Protocol. Used for connectionless active file transfer. (uses UDP)
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What is Port 53?
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DNS: Domain Name Service Protocol. Used to resolve internet names to IP addresses.
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What are the characteristics of fibre optic cabling?
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High expense but long distance. Expertise required upon installation. Supports up to 100Gbps. Immune to EMI and RFI.
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What are the characteristics of copper cabling? |
Low cost with a lower distance. Easy to install. Supports up to 10Gbps. Not immune to EMI and RFI.
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What is controlled access?
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Only allows 1 host to transmit at any on time. This ensures no collisions.
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What is contention-based access?
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Allows any number of hosts to transmit at any time. This means more data being transferred and collisions.
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What is in the first 3 bytes of a MAC address?
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OUI: Organizationally Unique Identifier.
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What is in the last 3 bytes of a MAC address?
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NIC: Network Interface Controller, device specific number.
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What is the ARP process?
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Address Resolution Protocol is used to convert IP addresses into physical addresses. PC1 only has PC2's IP address, so does an ARP request. PC2 sends a response with their MAC address which PC1 stores in their ARP table. Packets can now be sent from PC1 to PC2. |
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What is the transport layer protocol TCP? |
Transmission Control Protocol: - Reliable - Flow control - Bigger overhead - Must have connection - Error checking |
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What is the transport layer protocol UDP?
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User Datagram Protocol: - Connectionless - Unreliable - Less overhead - Doesn't check errors |
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What is network baseline?
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The act of measuring and rating the performance of a network in real-time situations. Used to help determine a problem on the network.
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What is the structure of an Ethernet Frame?
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1 Preamble: 8 bytes 2 Destination Address: 6 bytes 3 Source Address: 6 bytes 4 Type: 2 bytes 5 Data: 46-1500 bytes 6 FCS: 4 bytes |
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Describe the field header 'Version' in an IPv4 packet?
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The IP version. E.g. IPv4.
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Describe the field header 'TTL' in an IPv4 packet?
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Stops the datagram going in circles by setting a hop-count life time. |
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Describe the field header 'Protocol' in an IPv4 packet?
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This specifies which protocol the data is using.
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What are two field headers in an IPv4 packet?
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Source IP Address Destination IP Address |
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IPv6: What is the address type for Global Unicast?
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2001:: /3 Used on the internet to provide global routing to a single destination. |
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IPv6: What is the address type for Link Local?
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FE80:: /10 Used within a single link (subnet), and is stopped by a router. |
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IPv6: What is the address type for Loop Back?
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::1 /128 Used by every IPv6 device as a means of testing their protocol stack. |
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Explain the global routing prefix part of an IPv6 address?
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The first 48 bits which is like a network ID.
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Explain the subnet ID part of an IPv6 address? |
After the first 48bits, the next 16 bits define the subnets within a site.
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Explain the Interface ID part of an IPv6 address? |
The final 64 bits are like a host ID, a unique identifier. |
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Explain the Prefix Length part of an IPv6 address?
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The leftmost fields, along with the network bits length represented in CIDR format. Like a subnet mask. |
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What is a hub?
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An UN-intelligent device that connects networks together. - no routing tables. - sends and receives data in bit streams. |
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What is encapsulation?
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The process of taking data from one protocol and translating it into another, so the data can continue across a network.
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What is convergence?
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Different types of media all on one network. I.e. Image, video, etc.
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Explain multi-node fibre optic cabling? |
Mostly used for short distances, such as within a building or campus. More data can pass through at a given time, due to a larger core. - Less expensive. - Several modes of light |
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Explain single-node fibre optic cabling? |
Better for long distance, small diametral core that allows only one mode of light to propagate. - Higher bandwidth - 50x more distance than its counter-mode. |
