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CompTIA A+ 1101 (Core 1) (Retired) > 2.6 - Compare & contrast common network configuration concepts > Flashcards

2.6 - Compare & contrast common network configuration concepts Flashcards

1
Q

What does DNS translate?

2.6 Compare & contrast common network configuration concepts: DNS - Address

A

FQDNs (aka URLs)

Fully Qualified Domain Name

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2
Q

What are address records aka?

2.6 Compare & contrast common network configuration concepts: DNS - Address

A

A & AAAA records

(quad A)

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3
Q

What do address records do in DNS?

(A & AAAA)

2.6 Compare & contrast common network configuration concepts: DNS - Address

A

Link FQDNs with their IP addresses

(Fully Qualified Domain Names)

FQDN like www.dprocomputer.com

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4
Q

What addresses do A records correspond to?

2.6 Compare & contrast common network configuration concepts: DNS - Address

A

IPv4 addresses

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5
Q

What addresses do AAAA records correspond to?

2.6 Compare & contrast common network configuration concepts: DNS - Address

A

IPv6 addresses

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6
Q

What do MX records in DNS do?

2.6 Compare & contrast common network configuration concepts: DNS - MX

A

Gives email servers the destination email server’s FQDN

It essentially directs emails to an email server

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7
Q

What do MX records in DNS require for email destination setup?

2.6 Compare & contrast common network configuration concepts: DNS - MX

A

Email server with an active address record

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8
Q

What do Pointer (PTR) records in DNS do?

2.6 Compare & contrast common network configuration concepts: DNS

A

Does reverse lookup (IP to name)

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9
Q

What records are used for forward lookup? & reverse lookup?

For IP/domains

2.6 Compare & contrast common network configuration concepts: DNS

A

Address & PTR records

Address for forward, PTR for reverse

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10
Q

Meaning of MX record?

2.6 Compare & contrast common network configuration concepts: DNS - MX

A

Mail Exchanger record

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11
Q

Meaning of TXT record?

2.6 Compare & contrast common network configuration concepts: DNS - TXT

A

Text record

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12
Q

What are TXT records used for?

2.6 Compare & contrast common network configuration concepts: DNS - TXT

A

Email security & verification

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13
Q

3 types of TXT records used for spam management?

2.6 Compare & contrast common network configuration concepts: DNS - TXT

A
  • DMARC
  • DKIM
  • SPF

They’re typically used together

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14
Q

Meaning of DMARC?

2.6 Compare & contrast common network configuration concepts: DNS - TXT

A

Domain-based Message Authentication, Reporting, & Conformance

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15
Q

Meaning of DKIM?

2.6 Compare & contrast common network configuration concepts: DNS - TXT

A

DomainKeys Identified Mail

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16
Q

Meaning of SPF?

2.6 Compare & contrast common network configuration concepts: DNS - TXT

A

Sender Policy Framework

17
Q

What do SPF records in DNS do?

2.6 Compare & contrast common network configuration concepts: DNS - TXT: SPF

A

Specifies which email servers are allowed to send emails on behalf of a domain

  • If you set up an SPF record for “yourcompany.com” to authorize Gmail’s servers, only emails sent through Gmail’s servers will be approved.
  • If an impersonator uses a Microsoft server to send emails claiming to be from “yourcompany.com,” they won’t be approved by your SPF record because it only accepts emails from Gmail’s servers.
18
Q

What do SPF records prevent?

2.6 Compare & contrast common network configuration concepts: DNS - TXT: SPF

A

domain name spoofing & unauthorized email sending

19
Q

What does DKIM in DNS do?

2.6 Compare & contrast common network configuration concepts: DNS - TXT: DKIM

A

Verifies the authenticity & domain of origin of an email

By using digital signatures

It verifies the email message actually came from the claimed domain & has not been modified during transit

20
Q

How does DKIM enhance email security?

2.6 Compare & contrast common network configuration concepts: DNS - TXT: DKIM

A

Ensures emails have not been modified/tampered durng transit

The signature is changed if the email is modified at any point

21
Q

What does DMARC do?

2.6 Compare & contrast common network configuration concepts: DNS - TXT: DMARC

A

Specifies actions for unvalidated messages

22
Q

When are DHCP leases renewed?

2.6 Compare & contrast common network configuration concepts: DHCP - Leases

A

When device rejoins the network

23
Q

How do devices maintain the same temporary IP address assigned via DHCP?

2.6 Compare & contrast common network configuration concepts: DHCP - Leases

A

By periodically checking in with DHCP server

24
Q

What happens if a device fails to check in with DHCP?

2.6 Compare & contrast common network configuration concepts: DHCP - Leases

A

Lease expirese & the IP address returns to IP address pool

25
Q

When do devices have a lease timer for their IP address?

2.6 Compare & contrast common network configuration concepts: DHCP - Leases

A

When its assigned via DHCP server

26
Q

Difference between a static IP address & a reservation?

2.6 Compare & contrast common network configuration concepts: DHCP - Leases

A

Static IP address is configured at the client.
DHCP reservation is created at the server.

27
Q

Where does DHCP get IP addresses from?

2.6 Compare & contrast common network configuration concepts: DHCP - Scope

A

Preconfigured subnet pool

28
Q

What is a VLAN?

2.6 Compare & contrast common network configuration concepts: VLAN

A

Logical network segment created within a switch

(Logical = Virtual) (Segment = divide) | Improves network management

29
Q

Meaning of VLAN?

2.6 Compare & contrast common network configuration concepts: VLAN

A

Virtual LAN

30
Q

How are VLANs made/controlled?

2.6 Compare & contrast common network configuration concepts: VLAN

A

Via managed switches

31
Q

Meaning of VPN?

2.6 Compare & contrast common network configuration concepts: VPN

A

Virtual Private Network

32
Q

What do VPNs do?

2.6 Compare & contrast common network configuration concepts: VPN

A

Creates a secure & encrypted connection over public networks

CompTIA A+ 1101 (Core 1) (Retired) (23 decks)

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