networking

Question 1

What is VLSM?

Answer 1

Variable Length Subnet Mask: subnetting of subnets

Question 2

what us /31 subnet mask?

Answer 2

only in Cisco, point-to-point connection (2 hosts only)

Question 3

IPv6 2000 - 3999 adresses?

Answer 3

Globally routed (equivalent to unicast address class A, B, C)

Question 4

IPv6 address starting with FE80

Answer 4

Link local address (equivalent to private address in IPV4)

Question 5

IPV6 address starting with FF

Answer 5

multicast address: identifies a set of interfaces

Question 6

what is an anycast address?

Answer 6

identifies a set of interfaces so that a packet can be sent to any member of a set
–> more efficient than updating routers

Question 7

what is SLAAC?

Answer 7

Stateless Address Autoconfig: replaces DHCP in IPV6 (or DHCPV6)

Question 8

private ip ranges

Answer 8

10. 0.0.0 -10.255.255.255
11. 16.0.0 - 172.31.255.255
12. 168.0.0 - 192.168.255.255

Question 9

ARP in IPV6

Answer 9

NDP Neighbour Discovery Protocol

+ RA (router advertisement) & RS (router solicitation)

Question 10

anycast

Answer 10

lets one host update the routing tables for a group of other hosts –> which host is the closest –> used for datacenter

–> very efficient

Question 11

Which method defines a means which an IPv6 interface ID address is formed using the interfaces MAC address and a preexisting network prefix?

Answer 11

EUI-64

Question 12

How many bits are there in an IPv6 address?

Answer 12

128

Question 13

Which of the following addresses in IPv6 is similar to IPv4 public IP addresses?

Answer 13

A GUA (Global Unicast Address) is the IPv6 equivalent of an IPv4 Public address. These addresses are both meant to be routed on the internet.

A site-local address is similar to an IPv4 private address.

The concept of multicast is still the same between IPv4 and IPv6.

An anycast address is an address that is the same between multiple interfaces, and when routing takes place, the packet is delivered to the closest interface to the respective host.

Question 14

Which IPv6 address corresponds to a Multicast address?

Answer 14

FF00::/8 is the prefix for the multicast address range in IPv6.

FD00::/8 is the IPv6 Site-Local prefix range.

The FE80::/10 is the link-local address range for IPv6.

2000::/3 is the Global Unicast Address (GUA) prefix range for IPv6.

Question 15

Which of the following is an IPv6 loopback address?

Answer 15

::1 is the correct IPv6 loopback address, used to verify TCP/IP stack functionality. 127.0.0.1- 127.255.255.255 is the IPv4 loopback range.

Question 16

shortcut rules in ipv6

Answer 16

If an address has two or more groups of consecutive zeros, a double colon can be used. Keep in mind, a double colon can only be used once in the address.