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Google IT Cert: Course 2 > Bits & Bytes: Week 4, II and III (DNS & DHCP) > Flashcards

Bits & Bytes: Week 4, II and III (DNS & DHCP) Flashcards

1
Q

What type of Defined Resource Record is used to direct traffic from one domain name to another?

A

a CNAME record

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2
Q

This type of Defined Resource Record is used to point a certain domain name at a specific IPv4 IP address

A

an A Record

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3
Q

A single ___________ is configured for one ___________ but a _____________ can have many ___________

A

A Record, domain name; domain name, A Record

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4
Q

When a client request receives a server response for one domain name containing multiple IP addresses which it iterates through for each request.

A

DNS Round Robin

Ex.
Server sends first client: 1st IP, 2nd IP, 3rd IP
Server sends next client: 2nd IP, 3rd IP, 1st IP
Then: 3rd IP, 1st IP, 2nd IP
and loop

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5
Q

What is the logic behind dns round robin?

A

Traffic to a domain’s IP addresses will be fairly balanced

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6
Q

What’s the difference between an A record and a Quad A Record (AAAA Record)?

A

A Records are for IPv4, AAAA Records are for IPv6

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7
Q

Which defined resource record type would redirect a server from microsoft.com to www.microsoft.com?

A

the CNAME resource record

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8
Q

What does CNAME stand for?

A

Canonical name

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9
Q

ACRONYM:

MX Record

A

Mail Exchange Record

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10
Q

This resource record is used to deliver e-mail to the correct server

A

MX records

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11
Q

ACRONYM:

SRV Record

A

Service Record

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12
Q

This resource record is used to define the location of various specific services

A

Service Record

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13
Q

Which resource record has a field that’s entirely freeform?

A

Text Record

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14
Q

Which resource record can be used to communicate data not originally intended to be communicated via DNS?

A

Text resource records

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15
Q

What are used to demarcate where control moves from a TLD server to a an authoritative server?

A

Domains

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16
Q

ACRONYM:

FQDN

A

Fully Qualified Domain Name

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17
Q

How many levels of a domain, in total, can DNS support for a single FQDN?

A

127 levels

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18
Q

How long can an individual section of a domain name be?

A

63 characters

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19
Q

What is the maximum number of characters allowed for an entire FDQN?

A

255 characters

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20
Q

Zone files are simple configuration files that declare what?

A

Resource Records for a particular DNS zone.

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21
Q

These allow for easier control over multiple levels of a domain.

A

DNS Zones

22
Q

ACRONYM:

SOA

A

Start of Authority

23
Q

What declares the zone and the name of the name server that is authoritative for it?

A

the Start of Authority resource declaration

24
Q

What type of zone files allow DNS resolvers to request an IP and receive the FQDN associated with that IP in the response?

A

Reverse lookup zone files

25
Q

ACRONYM:

PTR

A

Pointer Record

26
Q

What type of record resolves an IP to a name?

A

a Pointer record

27
Q

Which three things are unique to a network and which is unique to a node out of the DNS server, IP Address, Gateway router and Subnet Mask?

A

The DNS server, Subnet Mask, and Gateway router are usually unique to a network, while the IP address is unique to a node.

28
Q

ACRONYM:

DHCP

A

Dynamic Host Configuration Protocol

29
Q

This is an application layer protocol that automates the configuration process of hosts on a network.

A

Dynamic Host Configuration Protocol

30
Q

client devices like desktops or laptops or even mobile phones do not need a ________ IP address.

A

Client devices don’t need a static IP address

31
Q

What enables the configuration of a range of IP addresses for use by client devices?

A

Dynamic Host Configuration Protocol dynamic allocation

32
Q

What’s the main difference between dynamic and automatic allocation?

A

Automatic IP allocation will remember a device and try to assign it the same IP if possible when in range. Dynamic allocation doesn’t keep track of devices.

33
Q

Manually specified pairing of an IP Address with a MAC number/specific device

A

Fixed Allocation

34
Q

ACRONYM:

NTP Servers

A

Network Time Protocol Servers

35
Q

This type of server is used to keep all computers on a network synchronized in time

A

Network Time Protocol Servers

36
Q

On which TCP/IP network layer will you find DHCP?

A

The application layer

37
Q

What is the process used by a DHCP configured client to get information about a network’s configuration is what?

A

DHCP Discovery

38
Q

What does a client broadcast to a DHCP server when it would like to be assigned an IP address?

A

a DHCP Discovery Message

39
Q

A UDP datagram containing a DHCP discovery message always has which two ports as its destination and source?

A

Destination: Port 67
Source: Port 68

40
Q

Where would you find the DHCPDISCOVER message?

A

Encapsulated in a UDP Datagram

41
Q

The IP datagram containing the UDP DHCPDISCOVER datagram always has which two IP addresses as its destination and source?

A

Destination: 255.255.255.255
Source: 0.0.0.0

42
Q

Which port does a DHCP Server listen on for IP address requests from clients?

A

Port 67

43
Q

From which port does a client always send a broadcast request for an IP address?

A

Port 68

44
Q

What message is sent with a destination port of 68, and source port of 67, a destination broadcast IP of 255.255.255.255 and a its own source IP?

A

a DHCPOFFER message

45
Q

What is sent in response to a DHCPOFFER message?

A

A DHCPREQUEST message

46
Q

How does a client device know that a DHCP message is meant for it?

A

The DHCP message has a field containing its MAC address.

47
Q

What is the client telling the DHCP Server when it sends a DHCPREQUEST message?

A

The client is saying that it accepts the IP address that the DHCP Server offered.

48
Q

What is sent in response to a DHCREQUEST message, thereby completing the DHCP discovery process?

A

a DHCPACK Message

49
Q

What begins when a client starts using the IP address it was assigned by a DHCP Server?

A

A DHCP Lease

50
Q

How long does a DHCP Lease usually last?

A

A few days or less

Google IT Cert: Course 2 (14 decks)

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