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ClSC0 > Routing/Subnetting/IPv6/IPv4 > Flashcards

Routing/Subnetting/IPv6/IPv4 Flashcards

1
Q

what is a fully specified static route?

A

Both exit interface and next hop are specified:

  • Destination network
  • Exit interface
  • Next hop IP address
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2
Q

what is a recursive static route?

what is it used for?

A

Only next hop is specified:
Used for default gateway.
-Destination Network
-Next hop IP address

(called recursive because it has to do two lookups, second one for next hop)

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3
Q

what is a floating static route?

A

Used for redundancy/failover if dynamic routing stops working, specifies:

  • Destination Network
  • Next hop IP address
  • Administrative Distance
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4
Q

what is a directly attached static route?

A

Only exit interface is specified:

  • Destination network
  • Exit interface
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5
Q

What kind of IPv6 is this and what is it used for?
FD00:: /7
FC00:: /7

A

unique local

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6
Q

What kind of IPv6 is this and what is it used for?

FE80:: /10

A

link local

They are used for IPv6 routing protocols to form neighbor adjacencies.

automatically generated, uses eui-64

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7
Q

What kind of IPv6 is this and what is it used for?

2000:: /3

A

global unicast

internet routing

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8
Q

What kind of IPv6 is this and what is it used for?
FF01:: /8
FF0E:: /12

A

multicast

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9
Q

IPv6 routing protocols use what address type for establishing adjacency?

A

link-local

FE80:: /10

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10
Q

IPv6 multicast

A

FF02:: /8
FF00:: /12

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11
Q

IPv6 global unicast

A

2000:: /3

public address/internet routing

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12
Q

IPv6 link local

A

link local
FE80::/10

They are automatically generated on an interface when you enable IPv6 on an interface.
They are used for routing protocols to form neighbor adjacency, and NDP discovery.

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13
Q

How does IPv6 eui-64 conversion work?

A

Converts 48-bit MAC address into the 64-bit host portion of an 128-bit IPv6 address.

  • Insert FF:FE in the middle
  • Invert 7th bit (2nd digit from left)

Odd = Odd ±2
Even = Even ±2
(0 becomes 2, 2 becomes 0)
(1 becomes 3, 3 becomes 1)

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14
Q

unique local

A

FD00:: /7
(previously FC00:: /7)
-private IP address; no internet
-needs unique global ID in case of merge.

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15
Q

What is class D/multicast range?

A

224-239

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16
Q

What is class B range?

A

128-191

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17
Q

Inside Global

A

Public IP of the NATed host (post-NAT)

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18
Q

Inside Local

A

Private IP of the NATed host (pre-NAT)

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19
Q

Outside Local

A

The IP address the devices on the LAN see for the remote host (post-NAT)

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20
Q

Outside Global

A

The true IP address configured on the remote host by that host’s admin (pre-NAT)

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21
Q

documentation IPv6 address

A

2001:Db8:0 /64

22
Q

What is automatically configured on an interface when enable IPv6?

A

link-local

FE80::/10

23
Q

what command allows a router to use IPv6 routing?

A

(config)# ipv6 unicast-routing

24
Q

How do you create an IPv6 static route?

A

ipv6 route 2000:2::/64 (next hop IP address)

25
Q

How do you create an IPv6 floating static route?

A

ipv6 route 2000::/64 (ipv6-gateway-addr) distance 1

26
Q

How do you create an EUI-64 address?

A

ipv6 address 2001:fc8:a52c:a::/64 eui-64

27
Q

How do you create a modified EUI-64 address?

A

ipv6 address 2001:db8::/64 eui-64

just specify network prefix and add eui-64

28
Q

What are the 3 parts of a global unicast?

A

48-bit (3 octet) global routing prefix assigned by ISP
16-bit (1 octet) subnet identifier for subnets
64-bit (4 octet) interface identifier for hosts

29
Q

They are automatically generated on an interface when you enable IPv6 on an interface.

A

link-local

FE80::/10

30
Q

What kind of address always uses EUI-64 rules for interface IDs?

A

link-local

FE80::/10

31
Q

multicast address for “all routers”

A

FF00::2/8

244.0.0.2

32
Q

multicast address for “OSPF routers”

A

FF00::5/8

224.0.0.5

33
Q

multicast address for “OSPF DR/BDRs”

A

FF00::6/8

224.0.0.6

34
Q

multicast address for “RIP routers”

A

FF00::9/8

224.0.0.9

35
Q

multicast address for “EIGRP routers”

A

FF00::A/8

224.0.0.10

36
Q

What are anycast addresses?

How do you configure one?

A
  • useful for load balancing
  • can specify a unique local or global unicast as an anycast address.
  • Just add ‘anycast’ to end of command:

ipv6 address 2001::99/128 anycast

37
Q

ID the 5 multicast scope types

A

FF01 - interface-local : can’t leave device.
FF02 - link-local multicast : can’t be routed.
FF05 - site-local : can be forwarded in a LAN.
FF08 - organization-local : can be forwarded in a WAN.
FF0E - global multicast : can be routed over internet.

38
Q

NDP NS

A

FF02::1

ICMPv6 type 135

39
Q

NDP NA

A

FF02::1

ICMPv6 type 136

40
Q

NDP RS

A

FF02:2

ICMPv6 Type 133

41
Q

NDP RA

A

FF02:1

ICMPv6 Type 134

42
Q

What is SLAAC?

A

Stateless Address Auto-configuration

-Hosts use RS/RA messages to learn IPv6 prefix on local link and then automatically generate an ipv6 address.

43
Q

What makes SLAAC different from eui-64?

A

SLAAC doesn’t need prefix to be entered, it learns it automatically from NDP.

44
Q

How do you enable SLAAC?

A

ipv6 address autoconfig

45
Q

What is DAD?

A

A function of NDP that prevents duplicate IPv6 addresses.
Uses NDP NS message
Syslog level 4.

46
Q

Directly attached IPv6 routes have what problem?

A

They won’t work on an Ethernet interface, only serial.

Requires recursive or fully specified static route instead.

47
Q

Required to use this type for link-local IPv6 next hops.

A

fully specified

48
Q

the solicited-node multicast group

A

FF02::1

The solicited-nodes multicast group is required for link-layer address resolution.

49
Q

the all nodes multicast group

A

FF02::1

The all- node group is used to communicate with all interfaces on the local link

50
Q

the all-routers multicast group

A

FF02::2

51
Q

172 range?

A

172.16.0.0 - 172.31.0.0

ClSC0 (18 decks)

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