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CCIE R&S - IPv6
CCIE R&S - Written - IPv6
| Question | Answer |
|---|---|
| What are the 8 fixed fields of an IPv6 header? | Version, Traffic Class, Flow Label, Payload Length, Next Header, Hop Limit, Source Address, Destination Address |
| What two shortcuts are there in IPv6 Address? | Replace fields of successive zeroes with a '::' once, Trim leading zeroes in every field |
| What three address types exist in IPv6? | Unicast, Multicast, Anycast |
| What are the 4 main address space types in IPv6? | global unicast, site local, link local, multicast |
| What is the range of the first field of Global Unicast addresses in IPv6? | 2000 - 3FFF |
| What value does the first field in the IPv6 site local address have? | FEC0 |
| What value does the first field in the IPv6 link local address have? | FE80::/10 |
| How are non-ethernet interfaces assigned a EUI-64 interface address? | A virtual MAC is taken from a pool on the router |
| What value does the first field in the IPv6 multicast address start with? | FF00::/8 |
| What does the second 8 bits of a IPv6 multicast address consist of? | 4 byte lifetime field (0 = permanent, 1 = temporary), 4 byte scope field (8 = organization, D = global) |
| How are modified EUI IPv6 address portion derived? | 48 bit MAC address with 7th most (Universal/Local) significant bit flipped, 'FFFE' inserted in the middle |
| How is the L2 next hop resolved in IPv6 NMBA networks? | Statically |
| This IPv6 ND message asks for information about a neighbor | Neighbor Solicitation (NS) |
| This IPv6 ND message is used for self-advertisement to other neighbors | Neighbor Advertisement (NA) |
| This IPv6 ND message asks for information about local routers | Router Solicitation (RS) |
| This IPv6 ND message self-advertises as an active router | Router Advertisement (RA) |
| What is the default interval of an IPv6 RA? | 200 seconds |
| What three additional pieces of information does an IPv6 RA carry? | MTU, hop limit, candidate default router information |
| Do Cisco routers advertise themselves as an IPv6 candidate router by default? | Yes |
| What address advertisements does an IPv6 router include in its RAs? | All 64 bit prefixes configured on an interface |
| In what two ways can an IPv6 host verify a desired host's 2 way reachability? | Sending probe to solicited node access and receive response or get a hint from higher layer protocol such as a TCP ACK |
| This IPv6 mechanism sends a neighbor solicitation to the solicited node multicast for unique address check | Duplicate Address Detection (DAD) |
| What source address does IPv6 Duplicate Address Detection (DAD) use? | The unspecified address :: |
| What destination IPv6 address is used to self-advertise to everyone on the link? | FF02::1 |
| Command to resolve a corresponding L2 address to an IPv6 address on a multipoint interface? | ipv6 neighbor (ipv6 address) (interface) (mac address) |
| Command in IPv6 that mimics IPv4 command 'show arp' | show ipv6 neighbors |
| What is the IPv6 replacement for IGMP? | Multicast Listener Discovery (MLD) |
| What new feature does MLD have that IGMP version 3 did not? | explicit tracking of receivers |
| What is the Embedded Rendezvous Point mechanism in IPv6? | The RP address is embedded into the multicast group address |
| What types of tunnels are available in IPv6 multicast? | IPv6 multicast over IPv4 tunnels, IPv6 multicast over IPv6 tunnels |
| What are three common IPv6 multicast address scopes? | 01 - node local, 02 - link local, 05 - site local |
| What are the two groups of IPv6 over IPv4 tunnels? | static and automatic |
| Which IPv6 tunnel is the allows for multiple protocols to travel over the same tunnel? (static or automatic) | GRE, static |
| Which IPv6 tunnel is good for point-to-point connections, has less overheard, but can't transport CLNS? (static or automatic) | IPv6IP, static |
| Which IPv6 tunnels determine their own tunnel endpoint? (static or automatic) | 6to4, ISATAP, IPv4-comptatible automatic |
| Which IPv6 tunnel mode provides automatic host to router and host to host tunneling? (static or automatic) | ISATAP, automatic |
| Command to turn on IPv6 routing? | ipv6 unicast-routing |
| What are the 5 IPv6 routing protocols? | RIPng, EIGRPv6, OSPFv3, IS-IS, MP-BGP |
| Which IPv6 protocols use a separate process from their IPv4 counterparts? | RIPng, EIGRPv6, OSPFv3 |
| How is the initial configuration of EIGRPv6 and OSPFv3 different from IPv4? | networks are enabled by interface commands, not under the routing process |
| What is different about EIGRP passive interfaces from IPv4 to IPv6? | They can only be configured under the routing process |
| After interfaces are configured for EIGRPv6, what must be done to make the protocol operational? | no shut' the process |
| What new restriction is added to the IPv6 'distribute-list' command? | Can only use prefix-lists |
| This address type cannot be used to source traffic. | Anycast |
| What is the range of IPv6 anycast address space? | Same as unicast |
| What does a IPv6 subnet router anycast address consist of? | Prefix followed by all 0s |
| What is the makeup of all globally aggregatable IPv6 unicast addresses? | Full 64 bit prefix - 2000::/3, next 45 bits are global routing prefix, last 16 bits is site level aggregator (SLA) |
| What is the makeup of a IPv6 solicited node address? | FF02::1:FF00:0000/104, lower 28 bits are lower 28 bits of unicast address |
| What is the unspecified IPv6 address? | ::/ |
| What is the restriction of an IPv6 unspecified address? | Can't be used as a destination |
| Give two ways to write a IPv4 compatible IPv6 address with 10.1.10.4 | ::10:1:10:4, ::A:1:A:4 |
| What two ICMPv6 message groups are there? | Error reporting, informational |
| How are ICMPv6 error report messages limited on Cisco devices? | Rate limited by minimum interval, default is 100 ms with bucket of 10 tokens |
| What command is needed to view CDP IPv6 information | show cdp neighbor detail |
| What two scenarios will cause hosts to use DHCPv6? | Host configuration or router sends RA with M flag (Managed Address Configuration) set |
| What is the IPv6 all DHCP relay agents and servers multicast address? | FF02::1:2 |
| What is the IPv6 all DHCP servers only multicast address? | FF05::1:3 |
| What port do IPv6 hosts send to with DHCPv6? | 547 |
| What port do IPv6 DHCP servers send to with DHCPv6? | 546 |
| What traffic does IPv6 implicitly permit? | ND traffic |
| How do you apply an IPv6 access-list on an interface? | ipv6 traffic-filter |
| What type of access-list does IPv6 not support? | Numbered |
| What two features are not supported in IPv6 QoS? | NBAR, cRTP |
| In order two match or set cos on an interface in IPv6, what two requirements must be met? | 802.1q interface, must be running CEF |
| What protocol does Multicast Listener Discovery (MLD) rely on? | ICMv6 |
| What type of mechanism does Source Specific Multicast use from the start in IPv6? | (S,G) |
| How do switches know which ports to forward multicast traffic on in IPv6? | MLD Snooping |
| What PIM versions are there in IPv6? | Sparse-mode, SSM mode |
| How is the IPv6 PIM DR chosen? | Highest priority, then highest IPv6 unicast address |
| How does a router derive a automatic 6to4 address? | 2002:border-routing-IPv4-address::/48 |
| After creating the tunnel interface, what additional configuration must be applied to allow activation of the tunnel? | Static route pointing to tunnel |
| What type of tunnels are point-to-multipoint? | All automatic tunnels: 6to4, ISATAP, and IPv4-compatible |
| What does the last 64 bits of a ISATAP IPv6 address consist of? | 0000:5EFE:[IPv4 address of ISATAP link] |
| What needs to be enabled for client auto-configuration in an ISATAP tunnel implementation? Why? | RA, it is disabled by default on tunnel interfaces |
| What is the administrative distance of a IPv6 static route pointing to an interface? | 1 |
| What must be included on command that specifies a static route to a broadcast interface? Why? | Next-hop address, no proxy-arp for IPv6 |
| How are connected routes brought in for IPv6 redistribution? | with 'include-connected' command, no network command to auto-pull |
| In OSPFv3, what is the new name for a network? | Link |
| What address sources OSPFv3 packets for non-virtual links? | Link-Local |
| How are LSAs expressed in OSPFv3? | [prefix, prefix length] |
| What two frame-relay maps are required for operation of IPv6 routing protocols? | neighbor's link-local with broadcast keyword, neighbor's global address |
| What is used for security in OSPFv3? | AH for authentication, ESP for encryption through IPv6 natively |
| What are the two new LSA types in OSPFv3? | Type 8: Link LSA, Type 9: Intra-Area |
| In OSPFv3 how do you peer with some neighbors but not all on a multi-access link? | Configure separate instance of same process number |
| How are routers identified by other routers in EIGRPv6? | 32-bit router ID |
| What value does the first field in the IPv6 unique local address have? | FC00::/7 |
Created by:
ajballer15
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