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A+ Certification > 1101: Chap 2 - Networking > Flashcards

1101: Chap 2 - Networking Flashcards

1
Q

Z1101-Chap2-5: Which of the following network connectivity devices operates at Layer 2 of the OSI model?

Hub
Switch
Cable
Router

A

Switch

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2
Q

What Layer of the OSI Model do Hubs operate at?

A

Layer 1: Physical

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3
Q

Layers of the OS Model

A

1: Physical
2: Datalink
3: Network
4: Transport
5: Session
6: Presentation
7: Application

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4
Q

What Layer of the OSI Model do Routers operate at?

A

Layer 3: Network

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5
Q

1101-Chap2-8: Which Wi-Fi standard is the fastest, operating in both the 2.4 and 5 Ghz frequencies?

802.11a
802.11ac
802.11ax
802.11n

A

802.11ax

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6
Q

1101-Chap2-9: Bob has a device that operates at 5 Ghz. He is unable to connect his device to a LAN that he hasn’t accessed before, although he has verified that he has the correct password. What type of network might pose this problem?

802.11g
802.11n
802.11ac
802.11ax

A

802.11g

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7
Q

SMB

A

Server Message Block: used to provide shared acces to file and printers on a network;

port 445

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8
Q

1101-Chap2-11: What port does Telnet use?

21
22
23
25

A

23

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9
Q

Port 21

A

FTP

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10
Q

Port 22

A

SSH

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11
Q

Port 23

A

Telnet

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12
Q

Port 25

A

SMTP

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13
Q

1101-Chap2-14: Which TCP/IP internet layer protocol is responsible or delivering error messages if communication between two computers fails?

ICMP
IP
TCP
UDP

A

ICMP

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14
Q

ICMP

A

Internet Control Message Protocol (ICMP) is used for reporting errors and performing network diagnostics. In the error reporting process, ICMP sends messages from the receiver to the sender when data does not come though as it should.

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15
Q

Multicast

A

IPv6 address that identifies multiple hosts, thus all will receive the packet sent

from Wikipedia: In computer networking, multicast is group communication where data transmission is addressed to a group of destination computers simultaneously. Multicast can be one-to-many or many-to-many distribution. Multicast should not be confused with physical layer point-to-multipoint communication.

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16
Q

Anycast

A

IPv6 address that has been assigned to multiple nodes, a packet will be delivered to one of them

from Wikipedia: Anycast is a network addressing and routing methodology in which a single IP address is shared by devices (generally servers) in multiple locations. Routers direct packets addressed to this destination to the location nearest the sender, using their normal decision-making algorithms, typically the lowest number of BGP network hops. Anycast routing is widely used by content delivery networks such as web and name servers, to bring their content closer to end users.

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17
Q

Unicast

A

IPv6 address that identifies a single node on a network

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18
Q

What is the RDP Port

A

3389

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19
Q

1101-Chap2-20: What network connectivity device does not forward broadcast messages, thereby creating multiple broadcast domains?

Hub
Switch
Bridge
Router

A

Router

Routers break up broadcast domains. Broadcast traffic from one port of a router will not get passed to other ports, which greatly reduces network traffic. Bridges, hubs and swithces will all forward broadcast packets

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20
Q

1101-Chap2-23: Your company just expanded and is leasing additional space in an adajcent office building. You need to extend the network to the new building. Fortunately, there is a conduit between the two. You estimate that the cable you need to run will be about 300 meters long. What type of cable should you use?

CAT-5e
CAT-7
CAT-8
MMF

A

MMF

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21
Q

MMF

A

Multi-mode optical fiber is a type of optical fiber; it can span distances of 300m

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22
Q

1101-Chap2-24: You want to ensure that client computers can download email from external email servers regardless of the protocol their email client uses. Which ports do you open on the firewall to enable this? (Choose two)

23
25
110
143

A

110 - POP3
143 - IMAP

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23
Q

IMAP port

A

143

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24
Q

POP3 Port

A

110

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25
Q

1101-Chap2-25: You are installing network cabling in a highly secure facility. The cables need to be immune to electronic eavesdropping. What type of cable should you use?

Fiber-optic
UTP
STP
Coaxial

A

Fiber-optic

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26
Q

1101-Chap2-26: Which networking device is capable of reading IP addresses and forwarding packets based on the destination IP address?

Hub
Switch
NIC
Router

A

Router

Routers operate at Layer 3, so they make their decisions on what to do with traffic based on logical addresses, such as IP address. Switches use media access control (MAC) addresses and are on Layer 2. Hubs and NICs operate at Layer 1

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27
Q

APIPA

A

Automatic Private IP Addressing, a computer self assigns a APIPA address when it cannot find a DHCP server. These addresses live in the range: 169.254.0.0/16

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28
Q

1101-Chap2-32: Which of the following IPv6 addresses is automatically assigned by the host when it boots and is only usable on the broadcast domain that it exists in?

2000::/3
FC00::/7
FE80::/10
FF00::/8

A

FE80::/10

This is called a Link-Local address and is similar to a 169.254.x.x APIPA address

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29
Q

1101-Chap2-33: You need to configure a wireless router for an office network. The office manager wants new devices to automatically join the network and announce their presence to the other networked devices. Which service should you enable to allow this?

DHCP
NAT
QoS
UPnP

A

UPnP

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30
Q

SNMP

A

Simple Network Management Protocol;

port 161/162 (traps)

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31
Q

LDAP port

A

389

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31
Q

NetBIOS (and NetBT) port

A

137/139

32
Q

What is the default subnet mask for Class A Networks?

A

255.0.0.0 or /8

32
Q

What is the default subnet mask for Class B Networks?

A

255.255.0.0 or /16

32
Q

What is the default subnet mask for Class C Networks?

A

255.255.255.0 or /24

33
Q

What is the IPv4 broadcast address?

A

255.255.255.255 or /32

34
Q

1101-Chap2-43: What rendition of SMB was used by Windows servers and NAS servers but is no longer often used?

CIFS
Samba
NFA
SMB3

A

CIFS

Common Internet File System: MS’s version of Server Message Block (SMB); No longer used

35
Q

1101-Chap2-44: For IPv6 which of the folloiwing statements is true? (choose two)

Each IPv6 interface can have only one address
Each IPv6 interface is requred to have a link-local address
IPv6 addresses are incompatible with IPv4 networks
IPv6 does not use broadcasts

A

Each IPv6 interface is requred to have a link-local address

IPv6 does not use broadcasts

36
Q

1101-Chap2-45: Which network connectivity device is seldom used in modern networks, except to extend a network?

Bridge
Hub
Switch
Router

A

Hub

Switches do the same and more features
Hub form a single collision domain for all ports
Switches have a collision domain for each port
Switches also maintain an ARP table to map ports to MAC addresses

37
Q

TFTP

A

Trivial File Tranfer Protocol: connectless, low overhead protocol; perfect for booting from a network; Port 69

38
Q

1101-Chap2-51: Which TCP/IP Port will an email client use to push email to its email server?

23
25
110
143

A

25 - SMTP

39
Q

1101-Chap2-52: A technician is going to set up a Wi-Fi network using standard omnidirectional antennae . Because of the building configuration, transmitting signals for the greatest distance is the technician’s primary criterion. Which standard should they use?

802.11a
802.11g
802.11n
802.11ac

A

802.11n

802.11n has the longest range (70m indoors and 250m outdoors), while 802.11ac is faster but shorter range, because it only operates on the 5Ghz frequency

40
Q

1101-Chap2-60: You have been asked to install a Wi-Fi network in a building that is approximately 100m long and 25m wide. Because of cost considerations, you will be uising 802.11ac. At a minimum, how many WAPs will you need?

2
3
4
6

A

3

802.11ac has a max indoor range of 35m

41
Q

1101-Chap2-62: You are installing networking cabling in a drop ceiling of an office space. The ceiling area is used to circulate breathable air. What type of cable must you install?

Coaxial
UTP
Fiber-optic
Plenum

A

Plenum

Plenum rated cables have a teflon coating that is non-toxic when burning

42
Q

1101-Chap2-64: Which of the following IP addresses is not a private address and therefore is routable on the Internet?

10.1.2.3
172.18.31.54
172.168.38.155
192.168.38.155

A

172.168.38.155

43
Q

1101-Chap2-67: Your network is currently running a mix of 802.11b and 802.11g devices. At the end of the year you have extra budget to upgrade some but not all of the wireless infrastructure. You want to upgrade to the newst technology possible but still maintain backwards compatibility. Which standard should you choose?

802.11g
802.11ac
802.11ax
802.11r

A

802.11ax

it transmits on both 2.4Ghz and 5Ghz frequencies

44
Q

1101-Chap2-70: You are configuring hosts on a network running IPv4. Which elements are requuiried for the computer to connect to the network?

IP address
IP address and subnet mask
IP address, subnet mask, and default gateway
IP address, subnet mask, default gateway and DNS servers

A

IP address and subnet mask

45
Q

1101-Chap2-74: You’ve been asked to set up a device thast will be monitored using an SNMP agent and manager. What port will the SNMP manager use when polling the agent?

TCP 143
UDP 143
TCP 161
UDP 161

A

UDP 161

46
Q

DNS Ports

A

53

47
Q

DHCP Ports

A

67 and 68

48
Q

1101-Chap2-79: You need to install an Internet connection for a forest ranger outlook tower, located faaaaar away from power lines. Which option would be best for broadband internet access?

Cable
DSL
Fiber
Satellite

A

Satellite

49
Q

802.11g

A

2.4 Ghz Only

50
Q

802.11n

A

2.4 Ghz and 5Ghz

51
Q

802.11ac

A

5Ghz only

52
Q

802.11ax

A

2.4 Ghz and 5Ghz

53
Q

NetBT

A

NetBIOS over TCP/IP

54
Q

1101-Chap2-86: Which of the following features does not require a managed network switch?

Priority of traffic
VLAN Configuration
Direct packets out of the proper port
Port mirroring

A

Direct packets out of the proper port

55
Q

1101-Chap2-89: What is the maximum distance allowed between a PoE injector and the ethernet device runing on a 1000BaseT Network?

50 meters
100 meters
250 meters
450 meters

A

100 meter

56
Q

1101-Chap2-106: Which of the following are connection orientated protocols? (choose two)

DHCP
TFTP
HTTPS
SSH

A

HTTPS
SSH

  • work on TCP
  • guarantee delivery of packets
57
Q

1101-Chap2-108: What is the primary difference between an IDS and an IPS?

IDS works on both a host and a network
IDS will not actively alert on suspect activity
IPS works in pairs
IPS will actively react to suspect activity

A

IPS will actively react to suspect activity

58
Q

1101-Chap2-115: Last weekend you installed and booted serveral more computers to be ready for Monday morning. you hear from employees as they come in that they cannot log in. Their desktops don’t seem to want to connect. You investigate and find that each faulty workstation has a 169.254.x.x IP address. WHat might you look at next?

DHCP scope
LAN connector broken
Windows patch unable to install
Corrupted Registry

A

DHCP scope

59
Q

1101-Chap2-121: Dylan is troubleshooting his IPv4 network. The network’s subnet mask is 255.255.192.0. Which of the following IP addresses is not on the same network as the others?

130.200.65.5
130.200.130.1
130.200.100.4
130.200.125.5

A

130.200.130.1

60
Q

1101-Chap2-122: Which of the following is a PoE Standard?

802.3bt
802.3b
802.11
802.11ax

A

802.3bt

61
Q

Power over Ethernet (PoE) standards

A

IEEE 802.3af (PoE) - Type 1 Device
IEEE 802.3at (PoE+) - Type 2 Device
IEEE 802.3bt (PoE++) - Type 3 Device

differ by how much power can be sent across the lines

62
Q

ONT

A

Optical Network Terminal

transducer: coverts optical signals (fiber) to electrical signals (copper)

63
Q

1101-Chap2-124: Which of the following is true of an ONT? (Choose two)

It stands for Optical Network Terminator
It converts fiber optic light signals to electrical (ethernet) signals
It is user installed
It requires external power to work properly

A

It converts fiber optic light signals to electrical (ethernet) signals

It requires external power to work properly

64
Q

1101-Chap2-128: Which of the following is a network of storage devices that a server can access as if it were a locally connected drive?

NAS
SAS
SAN
WAN

A

SAN

65
Q

1101-Chap2-132: In the US, the FCC imposes rules that govern radio communications. WHat is the maximum EIRP (watts) that can be transmitted in the 2.4Ghz band for point to multipoint WISP connection?

2 watts
4 watts
158 watts
125 mw

A

4 watts

66
Q

WISP FCC rules

A

2.4 Ghz point-to-multipoint: max of 4 watts
2.4 Ghz point-to-point: 4 watts to 158 watts
5 Ghz: max 125 mw

67
Q

1101-Chap2-133: Using which Wi-Fi channels does not require that your router has Dynamic Frequency Selection (DFS) and Transmit Power Control (TPC) built into the router?

Channels 36 to 48
Channels 52 to 64
Channels 100 to 144
Channels 149-165

A

Channels 36 to 48

68
Q

1101-Chap2-134: Which broadband network communications technology became more competitive with other types of service when, in 2021, the FCC ruled to include it in the Over-The-Air-Reception-Devices-Rule (OTARD), which protects the rights of those organizations to place antennas where they are needed?

Fios
Long-range fixed wireless
DSL
Satellite

A

Long-range fixed wireless

69
Q

1101-Chap2-140: What type of address is known as a DNS AAAA address?

IPv4
IPv6
MAC
Physical

A

IPv6

70
Q

1101-Chap2-142: What type of DNS record contains a list of users (IP addresses) that are authorized to send email on behalf of a domain?

DKIM
SPF
DMARC
A

A

SPF

Sender Policy Framework

71
Q

SPF

A

Sender Policy Framework

DNS record contains a list of users (IP addresses) that are authorized to send email on behalf of a domain

72
Q

1101-Chap2-143: What is the interface ID of the IP address 2001::1ae:f1a:308:833?

2001:0:0:0:
2001
1ae:f1a:308:833
833

A

1ae:f1a:308:833

  • the last 64-bits of an IPv6 address are the interface ID.
  • an IPv6 is 128-bits long, meaning 8 groups of hex numbers separated by a collon
  • the last 4 groups of hex numebrs are the interface ID
73
Q

What 5 GHz channels are set aside for domestic wifi use?

A

Channels 36 to 48

74
Q

What 5Ghz channel is set aside for industrial, scientific, or medical (ISM) use?

A

Channel 165

75
Q

IPv6 Link-Local Address

A

similar to APIPA for IPv4. Means host cannot contact a DHCP server and assigns its own address.

The prefix of IPv6 Link-Local Address is FE80::/10

76
Q

What are the ports for:

  • FTP
  • SSH
  • Telnet
  • SMTP
  • DNS
  • DHCP
  • HTTP
  • POP3
  • NetBios/NetBT
  • IMAP
  • SNMP
  • LDAP
  • HTTPS
  • SMB/CIFS
  • RDP
A
  • FTP - 20/21
  • SSH - 22
  • Telnet - 23
  • SMTP - 25
  • DNS - 53
  • DHCP - 67/68
  • HTTP - 80 (also sometimes 8080)
  • POP3 - 101
  • NetBios/NetBT - 137/139
  • IMAP - 143
  • SNMP - 161/162 (UDP)
  • LDAP - 389
  • HTTPS - 443
  • SMB/CIFS - 445 (Common Internet File System, CIFS, is a dialect of SMB)
  • RDP - 3389

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