Latest revision as of 12:22, 15 April 2014

hej

[edit] IPv6

• Tunnel-broker på gammal c2621 ... http://www.velocityreviews.com/forums/t379267-2621-ssh-client-hanging.html

  IOS (tm) C2600 Software (C2600-IK9O3S3-M), Version 12.3(15), RELEASE SOFTWARE (fc3)

  System image file is "flash:c2600-ik9o3s3-mz.123-15.bin"

• Nice Slides describing IPv6 Extension headers

[edit] Tough Questions

1. When implementing a 6to4 tummel, which ipv6 address is the correct translation of the ipv4 address 192.168.99.1?

   2002:c0a8:6301::/48

2. What does the command clear ipv6 ospf process accomplish?

   The OSPF database is repopulated. Then the shortest path first (SPF) algorithm is performed.

3. What does the command clear ipv6 ospf accomplish?

   Clears the routing table and repopulates it after the SPF algorithm is preformed.

4. What is ::/0 and ::/128

    ::/0 is default route and ::/128 is unspecified address

5. What is LSA type 9 in OSPF

   Intra-area prefix LSA

               OSPFv3          	OSPFv2
 0x2001	Router LSA      	1	Router LSA
 0x2002	Network LSA     	2	Network LSA
 0x2003	Inter-area Prefix LSA	3	Network Summary LSA
 0x2004	Inter-area Router LSA	4	ASBR Summary LSA
 0x4005	AS-External LSA 	5	AS-External LSA
 0x2006	Group Membership LSA	6	Group Membership LSA
 0x2007	Type-7 LSA      	7	NSSA External LSA
 0x0008	Link LSA	
 0x2009	Intra-area Prefix LSA	

1. IPv6-only-node -> NAT-PT -> IPv4-only-node
   IPv6 host wants to communicate with IPv4 host, what will occur

   IPv6 host can NOT use DNS to find IPv4 address (rob says: it does not understand IPv4 addresses)

   CORRECT: router will determine IPv4 address

2. Which two statemets are correct about 6to4 tunneling?

   Each 6to4 site revieves a /48 prefix in a 6to4 tunnel

   Prepend 0x2002 with the ipv4 address creates an IPv6 address that is used in 6to4 tunneling

3. What NSAP address is a private, locally administered address?

   NOT 39.xxxx.xxxx..

   NOT 48.xxxx.xxxx...

   NOT 52.xxxx.xxxx...

   CORRECT 49.0004.30ac.0000.3090.c7df.00

4. To enable BGP tunneling over an IPv4 backbone, the IPv4 address 192.168.30.1 is converted into a valid IPv6 address. Which three IPv6 addresses are acceptable formats for the IPv4 address?

   0:0:0:0:0:0:192.168.30.1

    ::192.168.30.1

   C0A8:1E01

5. What is the L2 multicast address when sending to 239.255.8.5 running on MAC 01.b2.7d.05.f1.80

   01.00.5e.7F.08.05 (25 bits , not 24 Rob thinks...)

6. Which of the following is a GRE tunnel characteristic?

   GRE tunnels can run through IPsec tunnels

   FALSE GRE impose more CPU overhead then IPsec on VPN gateways

   FALSE GRE tunnels does not support IPv6

   FALSE? GRE consists of two sub-protocols: ESP and AH

7. exhibit of "show ipv6 ospf interfaces"

   TRICK this commands does NOT show global IPv6 addresses

   CORRECT OSPFv3 uses Link-local addresses to establish neighbor adjacencies

8. For IPv6, what term or phrase best describes a type 9 LSA on OSPF?

   Intra-Area prefix LSA

9. What is the benefit of deploying IPv6 in a campus network using dual stack mode?

   IPv4 and IPv6 run alongside one another and have no dependency on each other to function

   FALSE: IPv6 and IPv4 share network resources

10. Which Three are characteristics of IPv6

    An IPv6 address is 128 bits long

    An IPv6 header contains the next header field (rob says: Shared with Protocol Field)

    An IPv6 router send RA messages

11. You have been tasked with setting up OSPF on an existing Cisco router using IPv6. Which command enables OSPF for IPv6 on a router?

    ipv6 router ospf process-id