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CCNA 200 - 125 Flash cards > Topic 5 - DNS > Flashcards

Topic 5 - DNS Flashcards

1
Q

What protocol and port number does DNS use?

A

UDP

Port 53

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2
Q

Two types of DNS lookups?

A

Forward lookup - the host asks about a domain name and an IP address is returned

Reverse lookup - the host asks about an IP address and a domain name is returned

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3
Q

Default least time on DHCP server.

A

1 day

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4
Q

What Interface does Cisco IOS DHCP relay agent supports?

A

unnumbered interfaces

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5
Q

Which Cisco IOS command will indicate that interface GigabitEthernet 0/0 is configured via DHCP?

A

show ip interface GigabitEthernet 0/0

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6
Q

Which statement about the nature of NAT overload is true?

A

applies a one-to-many relationship to internal IP addresses

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7
Q

command can you enter to display duplicate IP addresses that the DHCP server assigns?

A

show ip dhcp conflict 10.0.2.12

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8
Q

DHCP relay

A

DHCP relay agent is any host that forwards DHCP packets between clients and servers.

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9
Q

DHCP Client

A

Cisco IOS DHCP client enables a device to obtain an IP address from a DHCP Server dynamically using the DHCP protocol.

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10
Q

DHCP Server

A

Cisco IOS DHCP Server feature is a full DHCP Server implementation that assigns and manages IP addresses from specified address pools within the router to DHCP clients.

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11
Q

What are the details does DHCP offer message contain?

A

IP address
Domain name
lease

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12
Q

What type of message are DHCP DISCOVER and DHCP OFFER?

A

DHCP DISCOVER - Broadcast Message
and
DHCP OFFER - Unicast Message.

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13
Q

DHCP protocol standard?

A

RFC 2131

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14
Q

What TFTP is used to identify an external server that will be used to store the DHCP bindings database.

A

TFTP 150

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15
Q

is HSRP a Cisco proprietary protocol?

A

YES

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16
Q

Explain HSRP

A

Hot Standby Routing Protocol (HSRP) enables high availability by providing multiple default gateways with the same virtual IP address to hosts on a LAN.

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17
Q

Default priority on a HSRP?

A

Default priority is 100.

Remember highest number represents the highest priority

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18
Q

Range of HSRP

A

1 to 255

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19
Q

Preamble on HSRP

A

If preemption is enabled, the router with the highest priority becomes the active router
If priorities are equal, the current active router does not change

20
Q

What multicast address does HSRP v1 uses to send hello packet?

A

224.0.0.2

21
Q

What multicast address does HSRP v2 uses to send hello packet?

A

224.0.0.102

22
Q

Group of HSRP V1 and V2

A

V1 is 0 to 255

V2 is 0 to 4095

23
Q

what happens when an interface running HSRP 1 gets an packet from HSRP 2?

A

Packet is ignore

24
Q

Command to see real-time Translation on the router?

A

Debug ip nat

25
Q

Command to show all the translation?

A

Show ip nat translations

26
Q

3 methods of NAT

A

1 - Static
2 - Dynamic
3 - Overload

27
Q

PAT address translation also called as?

A

NAT Overload

28
Q

Explain NAT?

A

Network Address Translation (NAT) is used to map private IP addresses on a LAN to a public IP address(es) on the outside interface of the router

29
Q

The interface of the router connecting to the LAN network is?

A 
NAT 
#ip nat inside
30
Q

The interface of the router connecting to the WAN is?

A 
NAT Outside 
#ip nat outside
31
Q

Explain PAT?

A

Port-address translation
Commonly used for overloading.
An extension to NAT that permits multiple IP addresses on a LAN to be mapped to a single public IP address

32
Q

What is the local IP address of a private host on your network (e.g., a workstation’s IP address) called?

A

Inside Local

33
Q

What is the public IP address that the outside network sees as the IP address of your local host called?

A

Inside Global

34
Q

What is the local IP address from the private network, which your local host sees as the IP address of the remote host. called?

A

Outside local

35
Q

Explain NTP ?

A

The Network Time Protocol (NTP) synchronizes the time of day among a set of distributed time servers and clients

36
Q

What transport protocol does NTP use?

A

UDP

37
Q

What used in NTP to describe the distance between a device and the time source?

A

Stratum

38
Q

What is a disadvantage of NAT?

A

There is no end-to-end addressing.

39
Q

The Inside Local address is usually what?

A

An RFC 1918 address

40
Q

Which type of NAT maps a single inside local address to a single inside global address?

A

static

41
Q

The four steps in obtaining a lease are?

A

1 - DHCPDISCOVER
2 - DHCPOFFER
3 - DHCPREQUEST
4 - DHCPACK (if success)

42
Q

The DHCPv6 REPLY packet is what type? (broadcast, multicast, unicast)

A

Unicast

43
Q

What is dynamic NAT?

A
  • Automatically map IP to IP

- Typically a pool of available address

44
Q

What is Overloading NAT?

A
  • Automatically map many IPs to one IP

- Uses ports to track individuals from many

45
Q

___________specifies allowed IP for NAT rule

A

Access List

CCNA 200 - 125 Flash cards (8 decks)

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