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CCNA > Chapter 1 > Flashcards

Chapter 1 Flashcards

1
Q

What are the 6 common causes for LAN congestion

A
  1. Too many hosts in a collision or broadcast domains.
  2. Broadcast storms
  3. Too many multicast traffic
  4. Low bandwidth
  5. Adding hubs connectivity to the network.
  6. A bunch of ARP broadcasts.
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2
Q

What are the two advantages in using a routers in a network?

A
  1. Doesn’t forward broadcasts by default.
  2. Filters network based on Layer 3.
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3
Q

What are the advantages of using Layer 2 Switches?

A
  • breaks up collision domains
  • provides more bandwidth to users.
  • switch frames between ports.
  • low latency by using ASIC (Application-Specific Integrated Circuit)
  • stores MAC addresses
  • Layer 2 switches locate specific devices
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4
Q

What’s another name for NextGen Firewalls?

A

Cisco Firewall

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5
Q

What devices offer a full 7 Layer inspection?

A

NextGen Firewalls

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6
Q

NGFW offers the following 2 capabilities?

A
  1. Applications visibility and control (AVC)
  2. Intrusion Prevention System (IPS)
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7
Q

At a minimum, what does a NGFW must include?

A
  1. Be router and switch compatible.
  2. Add packet filtering w/ IPS and Malware inspection capabilities.
  3. Provide NAT
  4. Permit stateful inspection.
  5. Permit VPNs
  6. Provide URL and Application filtering.
  7. Third party integration
  8. Support for REST API
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8
Q

What are the benefits of having a network topology?

A
  1. Understanding where things belong.
  2. Brings order to complex models.
  3. Offer predictability.
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9
Q

What are the layers in a 3-tier hierarchical model?

A
  1. Core
  2. Distribution
  3. Access
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10
Q

The Core layer is responsible for what in a 3 Tier Hierarchical model

A
  • transports large amounts of data.
  • prime purpose is speed/reliability.
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11
Q

What is the responsibility of the Distribution Layer in a 3 Tier Hierarchical model?

A
  • provide routing, filtering and WAN access.
  • security and networking policies.
  • NAT
  • VLAN routing
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12
Q

What is the responsibility of the Access Layer in a 3 Tier hierarchical model?

A
  • control users and workgroups access to network resources.
  • create separate collision domains
  • device connectivity
  • QoS marking
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13
Q

What are characteristics of a collapsed Core/2 Tier Model?

A
  • less expensive, benefits smaller companies.
  • meant to maximize performance and availability while still allowing for scalability.
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14
Q

Describe Spine and Leaf Model.

A
  • Leaf = Top of Rack (ToR) are attached to multiple servers in a single rack.
  • Spine = are switches that connect all the leaves.
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15
Q

What are WANs needed for?

A
  1. Connection to Regional or Branch offices.
  2. Share data across large distances.
  3. Traveling workers.
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16
Q

What are the 3 major characteristics of WANs?

A
  1. Connect devices separated by a broad geographical area.
  2. Uses carriers and network providers
  3. Uses serial connections to provide access to bandwidth over larger geographical areas.
17
Q

Define:
CPE
CSU/DSU
Local loop
CO
Toll networks

A

CPE - owned by subscribers
CSU/DSU - connect DTE to digital circuit
Local Loop - demarc to closest switching office or central office
Central Office - connect customer’s network to provider’s switching network
Toll Network - trunk line inside a WAN provider’s network.

18
Q

What is the speed of a DS0?

A

64kbps
1 DS0 = 1 voice/data line

19
Q

What is the speed of a T1?

A

1.544 Mbps (DS1)
24 DS0 bundle

20
Q

What is the speed of a E1?

A

European equivalent of a T1
30 DS0
2.048 Mbps

21
Q

What is the speed of a T3?

A

44.736 Mbos
28 DS1 bundle

22
Q

What is the speed of a OC3?

A

155.52Mbps
3 DS3 (T3)
Fiber

23
Q

What is the speed of a OC-12?

A

622.08 Mbps
4 OC-3

24
Q

What is the speed of a OC-48?

A

2488.32 Mbps
4 OC-12

25
Q

What’s the standard for Cat3 UTP?

A

802.3 (10Base-T)

26
Q

What’s the standard for Cat5, 5E, or 6 UTP?

A

802.3u (100Base-TX) FastEthernet

27
Q

What’s the standard for fiber up to 412meters?

A

802.3u (100Base-FX)

28
Q

What’s the standard for twinax up to 25 meters?

A

802.3z 1000Base-CX

29
Q

What’s the standard for Cat5 up to 1,000 meters up to 1Gbps?

A

802.3ab 1000Base-T

30
Q

What’s the speed/distance and standard for Multi-Mode fiber?

A

802.3z (1000Base-SX)
1Gbps
62.5 micron - 220meters
50 micron - 559 meters

31
Q

What’s the standard for Single-Mode fiber?

A

802.3z (1000Base-LX)
3-10 kilometers

32
Q

What’s the standard for 10Gbos over UTP?

A

802.3an (10GBase-T)
Cat5E, 6 ,7

33
Q

When do you use straight-through cabling?

A

Host to switch/hub
Router to switch/hub

34
Q

For straight-thru cabling, which pins are for xmt/rcv?

A

1 and 2 xmt host/rcv switch
3 and 6 rcv host/xmt switch

35
Q

When would you use a crossover cable?

A

Switch to switch
Router to router
Hub to hub
Host to host
Router directly to host

36
Q

How is a crossover cable wired?

A

Pin 1 to 3
Pin 2 to 6
Pin 3 to 1
Pin 6 to 2

37
Q

What’s the standard for PoE?

A

802.3af or at

CCNA (2 decks)

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