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Cisco CCENT ICND1 > Infrastructure Services > Flashcards

Infrastructure Services Flashcards

1
Q

In DNS, what is the Berkley Internet Name Domain (BIND)

A

Stores different types of resource records used to resolve names.

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2
Q

What is an A record

A

A – end device address

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3
Q

What is and NS record

A

NS - authoritative name server

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4
Q

What is a CNAME record

A

canonical name (or Fully Qualified Domain Name) for an alias, used when multiple services have the single network address but each service has its own DNS entry

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5
Q

What is an MX record

A

mail exchange record, maps a domain name to a list of mail exchange servers for that domain

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6
Q

How does DHCP work

A

Client broadcasts DHCPDISOVER message to identify DHCP servers on the network

DHCP server replied with DHCPOFFER

Client may receive multiple DHCPOFFER messages if there is more than one dhcp server, therefore it DHCPREQUEST message identifies explicit server and lease offer that client is accepting

Assuming IP is available, server returns DHCPACK to acknowledge lease

If lease is no longer valid, due to timeout or another client taking lease, server responds with DHCPNAK (negative ack) message, which means process must start again

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7
Q

What is a DHCP server

A

Provides IP addresses

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8
Q

What is a DHCP relay

A

If no DHCP server is present, can forward DHCP requests to server

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9
Q

What is a DHCP client

A

Receives IP addresses

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10
Q

What is NTP

A

Provides time synchronisation between network devices

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11
Q

What is an ACL

A

Filters traffic at an interface

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12
Q

What are the allowed numbers to use for Standard ACLS

A

1-99

1300-1999

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13
Q

Where should a standard ACL be placed

A

As close to the destination as possible

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14
Q

What are the allowed numbers to use for extended ACLs

A

100-199

2000-2699

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15
Q

Where should extended ACLs be placed

A

As close to source as possible

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16
Q

What does NAT do

A

Translates private to public addresses

17
Q

What are the 3 type of NAT

A

Static - one to one mapping
Dynamic - many to many
PAT - many to one

18
Q

What is an inside local address

A

Host address on inside network

19
Q

What is an inside global address

A

Translated inside local address

20
Q

What is an outside global address

A

Registered address of internet host

21
Q

What is an outside local address

A

The address of internet host as it appears on the inside network

22
Q

What are the 3 p’s when it comes to ACLs

A

one ACL per protocol
one ACL per direction
one ACL per interface

23
Q

What are the 4 DHCP stages, in order

A

Discover
Offer
Request
Acknowledge

24
Q

At which phase of the DHCP process will a DHCP server provide the client with an IP address, subnet mask, and default gateway?

A

Offer

25
Q

What is an NTP stratum level

A

A value between 1 - 15 which indicates NTP priority
Lower value indicates higher priority
A value of 16 means no clocking is received

26
Q

How do you configure a device as a DHCP server

A

Create DHCP pool: ip dhcp pool Name
define addresses: network [ip subnet]/24
define default gateway: default-router [ip address]
select lease time: lease 7

exclude addresses: ip dhcp excluded-address [range]

27
Q

How is static nat configured

A

ip nat inside source static 10.0.0.19 192.0.2.1

28
Q

How is dynamic nat configured

A

access-list 10 permit 10.0.0.0 0.0.255.255

ip nat pool MyPool 192.0.2.1 192.0.2.254 prefix-length 24

ip nat inside source list 10 pool MyPool

29
Q

How is PAT configured

A

ip nat inside source list 11 pool MyPool overload

30
Q

What information can be viewed from using the show ip nat translations command

A 
protocol
inside local address
inside global address
outside local address
outside global address.
31
Q

What information can be view from using the show ip nat statistics command

A

active translations
type of nat being use
Inside and outside interfaces

32
Q

What is the benefit of using named IPv4 ACLs over numbered IPv4 ACLs

A

You can add, delete, and modify entries in a named ACL

33
Q

How is a dhcp relay configured

A

ip helper-address

34
Q

How do you verify the ip address part of a DHCP pool?

A

show ip dhcp pool

35
Q

How do the verify the ip address that has been leased to a client

A

show ip dhcp binding

36
Q

What does CPE stand for

A

Customer premises equipment

Cisco CCENT ICND1 (5 decks)

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