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StormWindsStudio ICND1 > Sesson 1 > Flashcards

Sesson 1 Flashcards

(47 cards)

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1
Q

What is a Physical Topology?

What are the 3 primary categories?

A

is the physical layout of devices and cabling.

BUS
STAR
MESH

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2
Q

How were Bus Topology connected and characteristics?

What issues did it have?

A

Physical cable - typically coax, terminate with vampire taps to that same cable

not scalable
communication issues
1 device at a time CMSA CD

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3
Q

what device was used in the middle of a star topology?

but logically how did it react?

A

a HUB

Logically like a bus topology
1 device can talk
SLOW with more devices
Collision domains

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4
Q

what type of devices are used today in star topology?

A

a switch

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5
Q

what benefits of a mesh topology

A

high availability through redundancy.

Full mesh - everyone connected to everyone is the most redundant. Very expenses

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6
Q

What is the 3 tier hierarchical model composed of?

A

ACCESS LAYERS -
Distribution Layer
Campus back bone

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7
Q

What type of devices live in the access layer of the 3 tier hierarchical model ?

what type of model of switches?

A 
Users
Phones
Printers
APs
any other device that needs to be connected to a switch.

catalyst switches layer 2

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8
Q

What type of devices live in the distribution layer of the 3 tier hierarchical model ?

what type of model of switches?

A

this layer connects multiple access layer switches together.

example - Aggregate switch - 4500x

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9
Q

where is Mesh topology used in the 3 tier hierarchical model and why?

A

between distribution and campus back bone.

multiple paths
redundancy if a path fail

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10
Q

what is the design flaw in the 3 tier hierarchical model?

A

multiple connections from access layer to distributions layer to avoid single point of failure

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11
Q

What does Logical Topology mean?

A

Is the path that traffic will take through the network from point A to point B.

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12
Q

Give an example of a logical topology

A

2 pcs next to each other but not on the same network. Separated by a Vlan

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13
Q

What is a firewall?

A

Device that provides security by limiting traffic flows.

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14
Q

what is the difference of a Standalone Access point and a light weight AP?

A

Standalone APs

  1. you manage them individually
  2. traffic flows from end user to AP to end user

light weight AP
1. requires a WLC - wireless lan controller (central location)

traffic flows from end user to AP to WLC to AP to end user.

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15
Q

what is the OSI Model?

A
  1. Physical
  2. Data link
  3. Network
  4. Transport
  5. Session
  6. Presentation
  7. Application
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16
Q

What is ATIL model? (TCP/IP)

A

Applications
Transport
Internet
Link

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17
Q

Explain what happens in the Application layer

A

all the services behind the scene that allow the application to work

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18
Q

Switches make their decision based on what layer?

A

Layer 2 (data link) or Link (tcp/ip model)

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19
Q

what is the name of the payload (PDU) when it is at the transport layer

20
Q

what is the name of the payload (PDU) when it is at network/internter layer ?

21
Q

what is the name of the payload (PDU) when it is at the link layer?

22
Q

what is the name of the payload (PDU) when it is at the application layer?

23
Q

what is the name of the payload (PDU) when it is at the physical layer?

24
Q

Examples of physical devices?

Study These Flashcards
A

Nics, cables, MTU, bits, fiber optic, copper cable

25
max distance for RJ45 cable?
100 meters or 328 feet
26
what is the wire standard for straight cable
``` 1 - green/white 2 - green 3 - yellow/white 4 - Blue 5 - Blue/white 6 - yellow 7 - Brown/white 8 - Brown ```
27
what is the standard for a cross over cable
pin 1 goes to pin 3 | pin 2 goes to pin 6
28
when do you use straight through cables and when you use cross over cable -
straight through cable - when connecting unlike devices togother (Pc to switch) cross over cable - when connecting like devices (switch to switch)
29
what is auto MDIX
devices changes a straight through cable transmission and receive pins so it can work...
30
characteristics of Multi mode fiber optic
LED base / can send multiple signals down the wire / alot of bounces shorter distances shorter bandwidth cheaper
31
characteristic of Single fiber mode optic
laser base Long distances High bandwidth
32
what is important for layer 2 operation
``` Frame Encapsulation Switches work in this layer MAC address are used here HDLC PPP ```
33
What is the min/max a ethernet frame can be transfered?
46 - Mininum transfer unit | 1500 Max transfer unit
34
what is FCS (frame check sequence)
a mathematical calculation that the source creates and when the destination device reads it and gets the same # that means that the frame has not be modified.
35
What is a MAC address
``` unique # that identifies a device on layer 2 or also known LAN Broadcast Domain Subnet Vlan ```
36
What is ARP?
Address Resolution Protocol ARP is a layer 3 to layer 2 mapping An example of a broadcast traffic Request are only sent within a vlan Local devices create a arp cache
37
what is the command to enter the arp cache?
arp -a
38
what is important in layer 3/internet layer?
Packet encapsulation Routing IP addressing (IPv4 and IPv6)
39
what is Service type mean in layer 3 packet?
allows us to differentiate what packets gets done first. Example - youtube video vs VoIP call VoIP calls will get a higher service (QOS) than the youtube stream.
40
what is TTL used for in packet header?
it is the max life span of a packet. Its expiration hop count. Prevents a packet from lasting forever. prevents loops on the network
41
what message is back to the PC when TTL expires?
ICMP TTL exceeded message
42
what does protocol field in a layer 3 packet mean
indicates what is happening on the transport layer - TCP or UDP
43
What is the list of importants in a packet layer 3 header
1. Source/Dest IP address 2. TTL 3. Protocol 4. Service Type
44
What are the benefits of TCP connection?
Transmission control protocol Provides flow control and error checking Allow for access to the network layer Ensures packet sequencing and reliable delivery connection oriented
45
Sequence number in network segment is good for?
keeps track of each segment.
46
What is windowing?
is a 3 way handshake SYN SYN - ACK ACK
47
What is window size?
is the amount of bytes that can be sent at a time for a segment. If there is not issues transferring, window size will grow. and reduce if there is a problem.

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