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CCNA > DNS/life of a packet > Flashcards

DNS/life of a packet Flashcards

1
Q

FQDN

A

Fully Qualified Domain Name.

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2
Q

Basic task of DNS

A

maps IP addresses to readable, human-friendly and easy to remember

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3
Q

What port does DNS use

A

UDP 53

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4
Q

ARP

A

Used to map the IP address to MAC address.

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5
Q

What layer does a ARP request happen?

A

Layer 2

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6
Q

what is destination MAC address fff.ffff.ffff

A

Layer 2 broadcast address

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7
Q

What do switches do with broadcast traffic?

A

forward it everywhere except the source.

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8
Q

what happens if a local DNS server apparatus doesn’t contain the needed record?

A

It will send the request up the chain until a positive response is received. which gets passed back down.

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9
Q 
what is a FQDN
www.
google.
com
mean
A

www. the specified service
google. the local domain
com the top level domain

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10
Q

What are the three different levels of DNS servers

A 
Local DNS Server
Top Level Domain (TLD) Server
Root Server
Authoritative
Non-Authoritative
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11
Q

What is the local DNS server

A

The server on the local network that contains the HOSTS files that map FQDN to IP address in the local subdomain

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12
Q

A record

A

Maps hostnames, or FQDNs to their IPv4 address

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13
Q

AAA record

A

Maps the FQDNs to their IPv6 address

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14
Q

CNAME Record

A

Maps canonical (alias) names to hostnames. You can have edc.edu the same as edc.org without issues.

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15
Q

PTR Record

A

Points out to DNS that their is a canonical name.

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16
Q

MX recrod

A

Mail eXchange
Maps to the email server that is specified for a specific domain. Its the record that determines how email travels from sender to recipient.

17
Q

Dynamic DNS (DDNS)

A

Permits lightweight and immediate updates to a local DNS database. This is very useful when FQDN remains the name. but the I{ address is able to change on a regular basis.

18
Q

DDNS

A

A method of updating traditional name servers without the intervention of a administrator (no manual editing or inputting of the configuration files is required)
DDNS provider supplies software

19
Q

Flag Field

A

contains a bit of that specifies whether the DNS message is a query or response

20
Q

Query of question field contains multiple sub-fields. two important ones

A

Resource name - name we want to lookup

Resource Type - type of record we are looking for

21
Q

what is in a DNS answer field

A

Resource name
Resource Type
Address

22
Q

when a DNS response message arrives at computer A what does it do first

A

It first updates its DNS cache.

23
Q

What can a computer do after is updates it cache?

A

it will can ping

24
Q

Most common type of record

A

A Record- contains a host address (IP address )

25
Q

most devices maintain a cache of DNS records that have been previously resolved using a DNS query

A

yes

26
Q

what record DNS record type assigns a secondary name to a database server

A

CNAME

27
Q

what record DNS record type determines the IP address of a VoIP controller

A

SRV. Service record. finds a service. System performs a DNS lookup of the service record associated with service

28
Q

what record DNS record type resolves an IPv4 address based on a FQDN

A

A record. Reverse of PTR record.

29
Q

what record DNS record type validates the digital signature of a email message

A

TXT record

30
Q

what record DNS record type determines the FQDN of an IP address

A

PTR. Pointer. reverse of how A record works

31
Q

what record DNS record type locates the email server for a domain

A

MX. Important for emails.

32
Q

What does DNS do?

A

Translate human-readable names into computer-readable IP address.

33
Q

Is DNS Hierarchical?

A

Yes. It follows a path.

34
Q

How many DNS root server clusters are there?

A

13

1000s’ of actual servers

35
Q

What is a generic top level domain?

A

.com .org .net, etc

36
Q

Can country codes be top level domains?

A

yes, over 275 countries.

.us, .ca. uk etc

CCNA (18 decks)

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