Jun 182011
 

http://ipv6.he.net/certification/

1. How many bits are in an IPv6 address?
128 X
64
32
48

2. Which of the following choices is a valid IPv6 address?
2001:0DB8:HE:6939::1
ipv6.example.com
192.168.0.1
2001:0DB8::0::FF2e:1
2001:0DB8:0:FF2E::1 X

3. How many /64 subnets are available in a /48 prefix?
256
340,282,366,920,938,463,463,374,607,431,768,211,456
18,446,744,073,709,551,616
65536 X

4. How many available IPv6 addresses are there in a /64 allocation?
18,446,744,073,709,551,616 X
65536
4,294,967,296
2^128

5. What operating systems currently support IPv6?
Linux
BSD
MacOSX
Vista/Windows 2008
All of the these support IPv6 X
May 162011
 

 

CIDR  Netmask # Networks # Hosts
  /1 128.0.0.0 128 A 2,147,483,392
  /2 192.0.0.0 64 A 1,073,741,696
  /3 224.0.0.0 32 A 536,870,848
  /4 240.0.0.0 16 A 268,435,424
  /5 248.0.0.0 8 A 134,217,712
  /6 252.0.0.0 4 A 67,108,856
  /7 254.0.0.0 2 A 33,554,428
  /8 255.0.0.0 1 A   16,777,214  
  /9 255.128.0.0 128 B 8,388,352
  /10 255.192.0.0 64 B 4,194,176
  /11 255.224.0.0 32 B 2,097,088
  /12 255.240.0.0 16 B 1,048,544
  /13 255.248.0.0 8 B 524,272
  /14 255.252.0.0 4 B 262,136
  /15 255.254.0.0 2 B 131,068
  /16 255.255.0.0 1 B   65,024  
  /17 255.255.128.0 128 C 32,512
  /18 255.255.192.0 64 C 16,256
  /19 255.255.224.0 32 C 8,128
  /20 255.255.240.0 16 C 4,064
  /21 255.255.248.0 8 C 2,032
  /22 255.255.252.0 4 C 1,016
  /23 255.255.254.0 2 C 508
  /24 255.255.255.0 1 C   254  
  /25 255.255.255.128 2 subnets 124
  /26 255.255.255.192 4 subnets 62
  /27 255.255.255.224 8 subnets 30
  /28 255.255.255.240 16 subnets 14
  /29 255.255.255.248 32 subnets 6
  /30 255.255.255.252 64 subnets 2
  /31 255.255.255.254 none none
  /32 255.255.255.255 1/256 C 1 (broadcast)
May 102011
 
Route Source Default Distance Values
Connected interface 0
Static route 1
Enhanced Interior Gateway Routing Protocol (EIGRP) summary route 5
External Border Gateway Protocol (BGP) 20
Internal EIGRP 90
IGRP 100
OSPF 110
Intermediate System-to-Intermediate System (IS-IS) 115
Routing Information Protocol (RIP) 120
Exterior Gateway Protocol (EGP) 140
On Demand Routing (ODR) 160
External EIGRP 170
Internal BGP 200
Unknown* 255

 

Apr 282011
 
#net bits (CIDR) netmask # hosts (hb^2) “size” Cisco ACL wildcard mask hex netmask
/0 0.0.0.0 4,294,967,296 The Internet:-) 255.255.255.255 00.00.00.00
/1 128.0.0.0 2,147,483,648 128A 127.255.255.255 80.00.00.00
/2 192.0.0.0 1,073,741,824 64A 63.255.255.255 C0.00.00.00
/3 224.0.0.0 536,870,912 32A 31.255.255.255 F0.00.00.00
/4 240.0.0.0 268,435,456 16A 15.255.255.255 F8.00.00.00
/5 248.0.0.0 134,217,728 8A 7.255.255.255 FC.00.00.00
/6 252.0.0.0 67,108,864 4A 3.255.255.255 FE.00.00.00
/7 254.0.0.0 33,554,432 2A 1.255.255.255 FF.00.00.00
/8 255.0.0.0 16,777,216 1A 0.255.255.255 FF.80.00.00
/9 255.128.0.0 8,388,608 128B 0.127.255.255 FF.C0.00.00
/10 255.192.0.0 4,194,304 64B 0.63.255.255 FF.E0.00.00
/11 255.224.0.0 2,097,152 32B 0.31.255.255 FF.F0.00.00
/12 255.240.0.0 1,048,576 16B 0.15.255.255 FF.F8.00.00
/13 255.248.0.0 524,288 8B 0.7.255.255 FF.FC.00.00
/14 255.252.0.0 262,144 4B 0.3.255.255 FF.FE.00.00
/15 255.254.0.0 131,072 2B 0.1.255.255 FF.FF.00.00
/16 255.255.0.0 65,536 1B 0.0.255.255 FF.FF.80.00
/17 255.255.128.0 32,768 128C 0.0.127.255 FF.FF.C0.00
/18 255.255.192.0 16,384 64C 0.0.63.255 FF.FF.E0.00
/19 255.255.224.0 8192 32C 0.0.31.255 FF.FF.F0.00
/20 255.255.240.0 4096 16C 0.0.15.255 FF.FF.F8.00
/21 255.255.248.0 2048 8C 0.0.7.255 FF.FF.FC.00
/22 255.255.252.0 1024 4C 0.0.3.255 FF.FF.FE.00
/23 255.255.254.0 512 2C 0.0.1.255 FF.FF.FF.00
/24 255.255.255.0 256 1C 0.0.0.255 FF.FF.FF.80
/25 255.255.255.128 128 1/2C 0.0.0.127 FF.FF.FF.C0
/26 255.255.255.192 64 1/4C 0.0.0.63 FF.FF.FF.E0
/27 255.255.255.224 32 1/8C 0.0.0.31 FF.FF.FF.F0
/28 255.255.255.240 16 1/16C 0.0.0.15 FF.FF.FF.F8
/29 255.255.255.248 8 1/32C 0.0.0.7 FF.FF.FF.FC
/30 255.255.255.252 4 1/64C 0.0.0.3 FF.FF.FF.FE
/31 255.255.255.254 PtoP links only 1/128C FF.FF.FF.FF
/32 255.255.255.255 This is a single host route(usehostnotation)
Sources:
RFC 1519 (1993) — Classless Inter-Domain Routing (CIDR)
RFC 1878 (1995) — Variable Length Subnet Table For IPv4