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Network+ > Things to remember > Flashcards

Things to remember Flashcards

1
Q

What is the standard for WIFI and what are the bands

A

802.11 and 2.5 or 5 ghz

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2
Q

What are the ports for HTTP and HTTPS?
What are the ports for Telnet?
What is the port for SMTP?
What are the ports for DNS?

A

Port 80 and 443
Port 23
Port 25
Port 53

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3
Q

What is Telnet?

What is NBstat?

A

Telnet allows remote commandline connection to other computers
NBstat displays current socket connections

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4
Q

What is an MSDS

A

Management of Safety Documents system

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5
Q

What is SNMP

A

Simple network management protocol -prim

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6
Q 
What do these class IPS always start with? 
Class A
Class B
Class C
Class D
A

Class A starts with 0
Class B starts with 10
Class C starts with 110
Class D starts with 224

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7
Q

Load Balancer

A

Used when multiple servers handle requests for a web server through the same public IP address

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8
Q

Difference between TFTP and FTP

A

FTP requires login

TFTP does not require a user login only uses

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9
Q

A network admin wants prevent requests from the internet coming directly to the users

A

Use a Proxy server

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10
Q

Linux version of ipconfig

A

Ifconfig

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11
Q

POP servers are on what port?

A

Port 110

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12
Q

What happens when pairs are untwisting too much?

A

Cross Talk - twisting around each other helps prevent the signal from bleeding between the wires

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13
Q

Naming covention that works at the Data Link Layer that is associated with IPV6

A

EUI-64

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14
Q

When is a dipole best used?

A

Outside because it generates a spherical signal

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15
Q

Class A and B block assignment allows for how many hosts?

A

65,534 Hosts for Class B

16.7 Million hosts for Class A

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16
Q

What Windows utility enables you to query information from the DNS server and change how your system uses DNS?

A

NsLookup used to both query various information from a DNS server and change how your system uses DNS

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17
Q

What is Bluejacking and Bluesnarfing?

A

Bluejacking is when a bluetooth node sends unsolicited messages to nearby bluetooth-enabled devices

Bluesnarfing is unauthorized access to data on a bluetooth-enabled device

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18
Q

PSTN is known as

A

POTS (Plain old telephone system) is a popular name for the public switched telephone network (PSTN)

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19
Q

What kind of connector for Fiber optic cable?

A

LC

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20
Q

What does an auto-sensing NIC do?

A

Determine the Link duplex + The speed/bandwidth of the link

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21
Q 
What port does SMTP use?
What port does HTTP use?
What port does POP3 use?
What port does DCHP use?
What port does FTP use?
A 
SMTP uses port 25
HTTP uses 80
POP3 uses 110
DHCP uses 67 
FTP uses 21
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22
Q

Good grounding provides protection against which threats?

A

Short circuits, ESD, and static

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23
Q

What protocol creates a point to point tunnel like VPN

A

GRE

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24
Q

What option is categorized data that can be accessed with an SNMP query

A

MIB - management information base

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25
Q

Best authentication method if users must connect to a seperate authentication server to gain access

A

Radius - devices must contact the NAS, which will then allow for the RADIUS server to authenticate.

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26
Q

What is a A record?
What is a MX record?
What is AAAA records?
What are CNAME records?

A

MX record is the record for email servers
A records are the primary name-to-IP address records
AAAA records are IPv6 versions of A records
Cname records are aliases with A records

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27
Q

What command can someone use on the server to display default router settings?

A

Route - allows users to display or modify the system’s routing table

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28
Q

What do routers do with broadcast traffic?

A

They discard it.

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29
Q

Get, response, set and traf are communications that occur between an SNMP manager and SNMP managed device. What are these examples of ?

A

PDU - protocol data units. They are sent as UDP traffic.

NMS is the program that sends and receives the communications.

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30
Q

What port is being used for RDP?

A

Port 3389

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31
Q

What type of connector would RG-6 cables use?

What type would Fiber optic cables use?

What type would UTP cables use?

A

RG-6 cables use F connector
Fiber optics use MTRJ
UTP use RJ-45

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32
Q

When a switch does flooding - what does that mean?

A

It is done when the switch doesn’t know the path to the destiination MAC address so it broadcasts an ARP request on all of its ports

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33
Q

What command is used to query DNS name servers

A

Dig

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34
Q

A 26 hexadecimal character key is used in which type of wireless encryption scheme?

A

104/128-bit WEP uses 26 hexadecimal character key

40/64 bit WEP uses a 10 character key

WPA and WPA2 use between 8 and 63 characters

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35
Q

What standard is commonly used to control thin-client wireless access points

A

LWAPP -Light weight access point protocol

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36
Q

What happens when a router receives a valid packet to a network that not in its routing table?

A

It will forward the packet to the next hop router in its default route.

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37
Q

What hardware tool is used to determine the length of a cable?

A

Time domain reflectometer (TDR)

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38
Q

Host has the IP address of 23.51.126.9. What is the default subnet mask?

A

255.0.0.0 because it’s a class A

  1. 255.0.0 = Class B
  2. 255.255.0 = Class C
  3. 255.255.255 = Broadcast Domain
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39
Q

Which networking device enables you to troubleshoot remotely using a loopback?

A

Smart jack

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40
Q

Which protocol of the below uses the LEAST overhead and odes not use a three-way handshake?

HTTP
HTTPS
FTP
UDP

A

UDP

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41
Q

1000BASE-LX has the longest maximum run distance for gigabit ethernet running multimode fiber - what is that distance?

A

550 meters

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42
Q

What is the default port for TFTP?

A

69

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43
Q

What protocol uses port 161?

A

SNMP

44
Q

What is Proxy caching?

A

When a porxy server caches web pages for users. If the web page is called, ISP bandwidth is not used to retrive the web page.

45
Q

If a network cable has a break in it, what can you use to confirm it?

A

TDR

46
Q

If the Cable certifier is showing NEXT, what does that mean the problem is?

A

Crosstalk

47
Q

A head map genereated by which device?

A

Wireless survey tool detect and may document the source, frequency, and strength of radio signals.

48
Q

What protocols are used in VOIP networks?

A

RTP, SIP, and H.323

49
Q

What type of wireless signals are best at penetrating the walls of buildings

A

802.11g

5GHZ does not penetrate as well as 2.4G

50
Q

What layer of the OSI model does an unmanaged switch operate?

A

Layer 2 because it deals with MAC addresses

51
Q

Which protocol would someone use if he wants to download messages from email servers?

A

POP3

52
Q

A protocol that uses a three-way handshake operates at which layer of the OSI model?

A

Transport

53
Q

What is VRRP
What is HSRP
What is SPB

A

Virtual router redundancy protocol - fallover routers in place

Hot standby Router Protocol - Cisco standard of VRRP

Shortest path bridgin - more efficient routes

54
Q

Which technology enables data to be transported over wiring that carries television signals?

A

DOCSIS - Data over cable service interface specification

55
Q

Which technique/process maps a single routable IP address to a single machine, enabling access to that machien from the outside network

A

SNAT - Static network address translation

56
Q

What translates all internal IP address to a single public IP address?

A

DNAT

57
Q

On a SOHO router, someone can’t get on the internet. The WAN is showing 0.0.0.0 from the web interface of the router. What can he do to resolve?

A

Do a DHCP renew via the router’s web browser interface. This is because the DHCP gives the SOHO router all of its network information.

58
Q

What WAN technology is associated with SONET?

A

OC-3 -OPTICAL CARRIER because SONET is fiber

59
Q

Which of the following layers of the OSI model corresponds to the link (network interface) layer of the TCP/IP model?

A

Data Link

Physical

60
Q

What port does SIP use
What port does SMB use
What port does RTP use
What port does MGCP use

A

5060 and 5061
445
5004 and 5005
2427 and 2727

61
Q

How would you describe ICMP?

A

A protocol that gets application data from one machine to another in a connectionless environment

62
Q

Every 100ms, a frame is sent out on a wireless network. This contains important information about your wireless network, such as your SSID and bandwidth speed. What is this frame called?

A

Beacon

63
Q

Which tool do you use to check if netbios is enabled?

A

Nbtstatd

64
Q

What problem is unique to fiber optic cabling?

A

modal distortion

65
Q

What does IDF stand for?

A

Intermediate distribution frame - a distribution frame in a central office.

66
Q

At which layers to the OSI model would you expect to find multiprotocol label switching (MPLS)?

A

MPLS exists between the traditional definitions of layer 2 (data link layer) and layer 3 (network Layer). MPLS headers sit between layer 2 frames and layer 3 packets. As they travel from a Label Edge Router (LER) to Label Switching Routers (LSR), these devices switch out the incoming frames, labels and packets with their own before sending them out. These layers switch the most as data moves from one place to another.

67
Q

MU-MIMO is a feature of the 802.11ac wireless standard. What does it provide?

A

Simultaneous transmission to multiple users

68
Q

What type of connection would not be recommended if you want to use VOIP?

A

Satelite

69
Q

When the DHCP is unavailable or unable to pass out and IP address, what is the DHCP fallover mechanism

A

APIPA is used when no DHCP server is prevent

70
Q

Which document defines services, products, and time frames for support provided by a vendor?

A

Statement of work

71
Q

A personal area network are made using point-to-point connections and short-distanced network interfaces. What isn’t used for PANS?

A

LANS

72
Q

What are common reasons for a poor or non-working fiber-optic link?

A

Wavelength Mistmatch
Dirty Connectors - number 1 cause
Distance limitations

73
Q

What is the formula for determining number of hosts in the subnet mask?

A

(2^(32-network length) ) - 2

74
Q

If I was planning a network of 400 hosts, what would the subnet mask be to accommodate this?

A

/23 - 512 hosts

75
Q

What setting can be configured on an 802.11n router so that is not available to 802.11g devices?

A

Spectrum - 802.11 can either use 2.4 ghz or 5 ghz

76
Q

A network running NAT will work well in a network where clients access the internet, but what’s one possible drawback?

A

Systems outside the network cannot easily access systems inside the NAT network

77
Q

What is SIP used for and what is RIP used for?

A

SIP stands for session initiation protocol and is used in VOIP to setup, tear down, and maintain your conversation.

RTP is a voice over protocol used to define the type of packets used on the Internet to move voice or data from server to clients.

78
Q

Which table maps a destination MAC address to a port within a switch?

A

MAC address lookup table

79
Q

The link lights on the front of your network switch are an example of what principle of Ethernet?

A

Carrier Sense

80
Q

Which IEEE Committee oversees the Ethernet technology?

A

IEEE 802.3

81
Q

Which 802.11 wireless standard has the greatest signal transmission distance?

A

802.11n

82
Q

If there are no MDIX ports on a switch, how do you connect two switches together?

A

Using a crossover cable. If it has the MDIX port, you can use a straight through cable.

83
Q

If the link light and the cable is good, what should you check if someone can’t get on the network, and is the only one?

A

Ping the loopback address. This will let you know if the NIC is good.

84
Q

If you want changes to the DNS “A” and “PTR” records to be updated automatically. What service would you use to automatically create or update a client’s DNS “A” and “PTR” records.

A

DHCP

85
Q

What is SCP?

A

Secure copy protocol - this is used to securely copy files between linxus machines. It is based on SSH

86
Q

What ports are used by H.323?

A

1720

87
Q

What is Unified Threat Management?

A

UTM is firewall technology that is packaged with many other security services

88
Q

When installing 802.11n network, what can you do to make sure only 802.11n clients acces the internet?

A

Disable 802.11b and 80211g

89
Q

Bob the network admin has noted that some wireless users are authenticating to nearby buildings on the corporate campus instead of to the WAP in the campus building. The users should be authenticating to their local building WAP. Which change to the nearby building WAPs would resolve this issue?

A

Reduce Transmission power

90
Q

Employees have been bringing in WAPs and connecting them to your network to enable wireless access with their laptops. Which authentication method should be used to prevent this from happening?

A

802.1x is also known as Network Access Control, an IEEE method developed to provide port-based authentication. In this scenario, the users will not be able to use their WAPs to connect to the network. The WAPs won’t be authenticated to access network resources.

91
Q

Which networking technology is best defined as Fast Ethernet?

A

Fast Ethernet is also known at 100BaseT. It can also be associated with 100BaseTX, 100BaseT4, and 100BaseFX. Are you seeing the pattern? If it has “100” in it, it’s good for Fast Ethernet. However, if I was given a choice between all of the different 100BaseXX’s, I would most likely choose 100BaseT as my final answer.

92
Q

Which device is used to break up broadcast domains?

A

Router

93
Q

Which choice is an economic approach to enable a home user with a single desktop computer to have internet access throughout the house?

A

Broadband over powerline - using a broadban connection distributed over the already existed power lines means the home user does not have to buy new cables or a new wi-fi router .

94
Q

A CSU/DSU is used to connect to which type of service?

A

T1 or E1

95
Q

The most common maximum distance for both ISDN and DSL lines between the user and the central switch is:

A

18,000 ft

96
Q

Which selection is a multiplexing technology in WAN environments that combines multiple data streams onto a single fiber optic cable?

A

CWDM - Course wavelength division multiplexing

97
Q

Which technique/process maps a single, routable IP address to a single machine, enabling access to that machine from outside the private network?

A

SNAT - Static network address translation

98
Q

Benefits of IPv6 over IPv4

A

IPv6 has a number of beneficial features compared to IPv4: IPv6 uses packet labeling and IPSec for built-in security. IPv6 has larger network IDs and subnet masks, allowing for virtually infinite subnetting. However, IPv6 also must have much larger headers due to the size of the IPv6 addresses. Large headers require more processing power by NICs and is not considered a benefit.

99
Q

Which layer of the OSI model includes HTTP?

A

Application Layer

100
Q

CHAP, MS-CHAP, and PAP are all authentication protocols for remote connectivity. However, the EAP authentication protocol offers something the other three do not. What is it?

A

It supports special authentication devices such as smart cards

101
Q

What technique would enable you to join multiple connections together into one logical connection to increase network transmission bandwidth?

A

Bonding

102
Q

Which of the following is NOT an aspect of Asymmetric Digital Subscriber Line (ADSL)?

A.
ADSL must be within 18,000 feet of a telephone company’s central office.

B.
ADSL has faster download speeds than PRI ISDN.

C.
ADSL uses regular PSTN lines.

D.
ADSL is a dial-up service.

A

ADSL is a dial-up service

103
Q

A network technician must set up a SOHO network to give all employees access the Internet. The company has the following equipment:
Four computers with wired and wireless NICs
A router with three LAN ports
Two Ethernet cables
A cable modem
The manager wants as many computers physically connected as possible instead of using wireless connections. Which setup would meet this requirement with the available equipment?

A

The modem and one PC can be physically connected to the router. All other PCs must connect wirelessly.

104
Q

Bob wants to setup a wireless network for his business. The network technician he has hired suggests that he utilizes the 802.1X standard for wireless authentication. Which of the following would he want the tech to setup?

A

Radius

105
Q

A technician connected two computers with a length of UTP cable crimped with RJ-45s. Computer A sends data out on pins 1 and 2. Which of the following pins will Computer B receive the response on?

A

3 and 6

Network+ (3 decks)

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