Deploy Networking Devices Flashcards
1
Q
Repeater
A
- Boosts signal along cable run to overcome attenuation
- Works at OSI layer 1
- Available in both copper and fiber (OEO) Optical-electrical-optical repeater
2
Q
Media Converter
A
- Converts two cable segments of different Media
- Physical layer of OSI model
3
Q
SMF to TP
A
- Powered converters that change light from SMF cabling to electrical signals and vice versa
4
Q
MMF to TP
A
- Converts different signals from MMF to TP
5
Q
SMF to MMF
A
- Passive (unpowered) devices that convert between fiber cabling types
6
Q
Hub
A
- Effectively a multiport repeater
- All ports are on same CD and shared media access area
- All node interfaces are half duplex and use same media bandwidth
- No configuration options
7
Q
MDI vs MDI-X
A
- Medium Dependent Interface refers to interface on end system
- interface on Hub is MDI crossover(X)
- Tx wires on host must connect to Rx wires on hub
8
Q
Bridge
A
- Works at datalink layer
- Establishes separate physical networking segments while keeping all nodes on logical network
- Reduces CDs
- Each segment can have separate media bandwidth
- Forwards only appropriate traffic
- Builds MAC table to know which addresses are on which ports
- If no record exists (of if frame is multi or broadcast) bridge flooded frame to all segments to find it.
9
Q
Switch
A
- Performs same function as bridge, but with each port being a separate CD
- Effectively establishes separate P-P connections between nodes
- Collisions only effect network sement
- All connected to same BD, except if there are VLANs
10
Q
Microsegmentation
A
- The creation of point-point links between network nodes using a switch
11
Q
NIC
A
Network Interface Card
- Transceiver component used to physically connect node to network transmission medium
- Most designed for copper and read for 10/100/1000 operation, and support Gigabit ethernet
- Can also have multiple ports on same card for connection to different networks or link aggregation
12
Q
MAC Address
A
Media Access Control address
- Unique hardware address on NIC
- Can also be called EA(Ethernet Address) or EUI (Extended unique identifier)
- Also referred to as local or physical address
13
Q
PDU
A
Protocol Data Unit
14
Q
Frame
A
- PDU used by ethernet
- Encapsulates higher level payloads
- Contains: Preamble - SFD- Destination MAC - Source MAC - Ether type - Payload - FCS
- Preamble and SFD are used for clock synchronization as part of CSMA/CD protocol
- FCS is error checking 32-bit field, also called CRC (Cyclic redundancy check)
- Sending and receiving devices run same check to determine damage on frame
- No built-in method to retransmit if there is damage
15
Q
Broadcast Address
A
- The I/G bit of a MAC address determines whether frame is address to single node or group.
- A MAC consisting of all 1s is a broadcast address and should be processed by all nodes on BD
16
Q
MTU
A
Maximum transmission unit
17
Q
Ethernet Frame Size
A
- Minimum length is 64 bytes
- Maximum is 1518 byes
- Some Gigabit and 10 GbE products support larger(jumbo) frames, but this is not standardized
18
Q
Packet Sniffer
A
- Captures frames moving along network medium
- Basic software based version interrogates frames receivedf by NIC by installed special driver
- Allows frames to be read from network stack and saved to file on disk
19
Q
SPAN
A
Switched Port Analyzer/Mirror port
- Packet sniffer attached to a specially configured port on switch
- Receives copies of frames address to nominated access ports
- Not completely reliable
20
Q
Passive TAP
A
Passive test access point
- Box with ports for incoming and outgoing network cabling and inductor or splitter
- Physically copies signal from cabling to monitor port
- Usuable for copper of bier
- Receives every frame corrupt or not and has not load issues
21
Q
Active TAP
A
- Powered device that performs signal regeneration
- Necessary for some Gigabit and fiber splitting circumstances
22
Q
tcpdump
A
Command-line pack capture unity for linux
- Basic syntax: tcpdump -i eth0
- eth0 would be the interface to listen on
