642-885 - Deploying Cisco Service Provider Advanced Routing (SPADVOUTE)
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How many questions are there on the 642-885 exam?
There are 65-75 questions on the 642-885 exam to be completed in 90 minutes .
How long is the 642-885 exam?
The 642-885 exam is 90 minutes to complete 65-75 questions.
How much does the 642-885 exam cost?
The 642-885 exam is $300. The exam provider is Pearson Vue and you can register for the exam on their website.
What is the best way to study for the 642-885 exam?
The best way to study for the 642-885 exam is to practice at Exam.com.
Which two functions are supported for BGP extension MP-BGP for IP multicasting? (Choose two.)
A network can support incongruent unicast and multicast topologies.
MP-BGP is an enhanced BGP that carries routing information for multiple network layer protocols and IP multicast routes.
Which difference occurs between intradomain and interdomain routing technology?
PIM is used in intradomain routing technology and uses reverse path forwarding mechanism to implement optimize multicast data forwarding.
Which option shows the equivalent multicast MAC address mapping of multicast address 184.108.40.206?
A CRS router that runs Cisco IOS XR has dual routing processors installed. Which solution should be implemented to prevent OSPF adjacency flapping if the primary routing processor fails?
Which technology is categorized as multicast ASM and multicast SSM?
Which keyword is used in the syntax to refer to Cisco IOS XR address-family groups, session groups, or neighbor groups?
When implementing Anycast RP, the RPs are also required to establish which kind of peering with each other?
In Cisco IOS-XR, the maximum-prefix command, to control the number of prefixes that can be installed from a BGP neighbor, is configured under which configuration mode?
When a BGP route reflector receives an IBGP update from a non-client IBGP peer, the route reflector will then forward the IBGP updates to which other router(s)?
To the EBGP peers and other clients only
A service provider requests more details about the recent Inter-AS MPLS VPN Option B configuration that was recently deployed. Consider this configuration: router bgp 3717 address-family vpnv4 unicast retain route-target all commit ! Which option describes why this particular command is needed?
In the Inter-AS Option B design, no local VRF is maintained on the ASBR routers,so the default behavior of the operating system is to deny any route-target extended community that is encoded in the incoming iBGP updates. This configuration permits VPNv4 communication by accepting the iBGP updates even if no route targets are configured locally.
Which multicast implementation is preferred for traffic that is required by a small number of receivers across a large distributed network?
Which multicast group range is reserved for SSM?
Which two options are characteristics of configuration templates used by Cisco IOS XR to optimize BGP peering implementations? (Choose two.)
Session groups are used to inherit address family-independent configurations.
Session groups can be included within a neighbor group.
Each router (RTA, RTB, and RTC) has one iBGP adjacency with the route reflector router RTD. Router RTC has an iBGP route advertised by RTA, but the same route is missing from RTB. The network engineer verifies that route filtering does not deny the route advertisement. Which action corrects the problem?
RTD(config-router)#neighbor 192.168.1.1 route-reflector-client RTD(config-router)#neighbor 192.168.1.1 description RTA RTD(config-router)#neighbor 192.168.1.2 route-reflector-client RTD(config-router)#neighbor 192.168.1.2 description RTB
Which field in the IPv6 header can be used to set the DSCP value?
Which two BGP mechanisms are used to prevent routing loops when using a design with redundant route reflectors? (Choose two.)
R1 is designated as the PIM RP within the SP core. Which two configuration parameters must be used to enable and activate R1 as the BSR and RP for the core environment? (Choose two.)
ip pim bsr-candidate loopback0
ip pim rp-candidate loopback0
Which two options are advantages of an IPv6 dual-stack implementation in an enterprise environment? (Choose two.)
does not have to worry about NAT traversal
supports multicast properly
What must occur before an (S,G) entry can be populated in the multicast routing table?
The parent (*,G) entry must be created first
Which configuration for implementing 6PE on an IS-IS-enabled Cisco IOS XR router is correct?
interface GigabitEthernet0/0/0/0 ipv6 address 2001:DB8:DD11::1/64 router isis ipv6-tun net 49.0000.0000.00010.00 address-family ipv6 unicast single-topology interface GigabitEthernet0/0/0/0 address-family ipv6 unicast router bgp 200 bgp router-id 220.127.116.11 address-family ipv4 unicast address-family ipv6 unicast redistribute connected redistribute isis ipv6-tun neighbor 18.104.22.168 remote-as 200 address-family ipv4 unicast address-family ipv6 labeled-unicast
What is one of the configuration errors within an AS that can stop a Cisco IOS-XR router from announcing certain prefixes to its EBGP peers?
Some prefixes were mistagged with the no-export BGP community
Which command configures a Source Specific Multicast on a Cisco IOS XR router?
configure multicast-routing address-family ipv4 interface all enable exit router igmp version 3 commit
Which two statements correctly describe the BGP ttl-security feature? (Choose two.)
This feature protects the BGP processes from CPU utilization-based attacks from EBGP neighbors which can be multiple hops away
This feature needs to be configured on each participating BGP router
Which command set should be used for a 6to4 tunnel in a Cisco IOS XE router, considering the border interface with IPv4 address of 22.214.171.124?
interface Tunnel2002 ipv6 enable ipv6 address 2002:D1A5:D902::1/128 tunnel source Ethernet0/0 tunnel mode ipv6ip 6to4
In Cisco IOS-XR, the ttl-security command is configured under which configuration mode?
Which command set implements BGP support for NSF/SSO on Cisco IOS XE between a PE and a route reflector?
On RR: router bgp 300 no synchronization bgp log-neighbor-changes bgp graceful-restart restart-time 120 bgp graceful-restart stalepath-time 360 bgp graceful-restart neighbor 10.20.20.2 remote-as 200 neighbor 10.20.20.2 update-source Loopback0 no auto-summary ! address-family vpnv4 neighbor 10.20.20.2 activate neighbor 10.20.20.2 send-community both neighbor 10.20.20.2 route-reflector-client exit-address-family On PE: router bgp 300 no synchronization bgp log-neighbor-changes bgp graceful-restart restart-time 120 bgp graceful-restart stalepath-time 360 bgp graceful-restart neighbor 10.20.20.1 remote-as 300 neighbor 10.20.20.1 update-source Loopback0 no auto-summary ! address-family vpnv4 neighbor 10.20.20.1 activate neighbor 10.20.20.1 send-community both exit-address-family !
Which two attributes does BGP select before MED? (Choose two.)
Which two methods represent IPv6 tunneling implementations? (Choose two.)
manually configured tunnels
In secure multicast, which protocol is used to distribute secure keys to a multicast group?
What are three BGP configuration characteristics of a multihomed customer that is connected to multiple service providers? (Choose three.)
The multihomed customer announces its assigned IP address space to its service providers through BGP
The multihomed customer has to decide whether to perform load sharing or use a primary/backup implementation
The multihomed customer configures outbound route filters to prevent itself from becoming a transit AS
An SP core is running PIM on the network. Multicast groups in this network are in the 126.96.36.199/8 range. Which command enables multicast routing operations without using an RP?
ip pim ssm default
Which information does the multicast supported router need to forward the multicast traffic over the source or shared tree?
Which statement is correct regarding MP-BGP?
MP-BGP can indicate whether an advertised prefix (NLRI) is to be used for unicast routing, multicast RPF checks or for both using different SAFIs.
Which configuration would an engineer use to exchange IPv6 multicast routes via BGP with a neighbor that does not support the corresponding Multicast SAFI on Cisco IOS XE?
router bgp 100 bgp router-id 188.8.131.52 no bgp default ipv4-unicast neighbor 2001:DB8::10 remote-as 201 neighbor 2001:DB8::10 update-source GigabitEthernet 0/10 address-family ipv6 neighbor 2001:DB8::10 translate-update ipv6 multicast unicast neighbor 2001:DB8::10 activate no synchronization exit address-family address-family ipv6 multicast neighbor 2001:DB8::10 activate network 2001:DB8:CDCD:1::/64 exit-address-family
Which type of BGP session behaves like an EBGP session during session establishment but behaves like an IBGP session when propagating routing updates where the local preference, multi-exit discriminator, and next-hop attributes are not changed?
Intra-confederation EBGP sessions
Which command set is used to implement an IPv6 PIM with the global scope embedded RP address of 2001:DB8::1 on a Cisco IOS XE router?
ipv6 unicast-routing ipv6 multicast-routing int Lo0 ipv6 mld join-group FF7E:0120:2001:DB8:1111::4321
Which IPv6 mechanism occurs between a provider edge router and the customer premises equipment router to allow an ISP to automate the process of assigning a block of IPv6 addresses to a customer for use within the customer network?
DHCPv6 Prefix Delegation
A network engineer for an ISP wants to reduce the number of iBGP adjacencies. A merge is taking place with another ISP network, so the network engineer needs to make both ASNs look like a single network for the Internet. Which BGP technology is most suitable?
The 184.108.40.206 multicast IP address maps to which multicast MAC address?
Which two options are the common methods for implementing Site of Origin on Cisco IOS XE routers for loop avoidance in multihome BGP customers? (Choose two.)
Configure the route-map in command on the CE BGP neighbor.
Configure Site of Origin directly on the CE BGP neighbor command.
Which three statements are correct regarding PIM-SM? (Choose three.)
There are three ways to configure the RP: Static RP, Auto-RP, or BSR
Different RPs can be configured for different multicast groups to increase RP scalability
Candidate RPs and RP mapping agents are configured to enable Auto-RP
The IPv6 2002::/16 prefix is used in which kind of implementations?
6 to 4
Which of the following can be used by dual-stack service providers supporting IPv4/IPv6 customers with dual-stack hosts using public IPv6 addresses and private IPv4 addresses?
Which two statements correctly describe the RPF check when a multicast packet arrives at a router? (Choose two.)
The router looks up the source address in the unicast routing table to determine if the packet has arrived on the interface that is on the reverse path back to the source
If the packet has arrived on the interface leading back to the source, the RPF check passes and the packet is forwarded. If the RPF check fails, the packet is dropped
Which statement is correct regarding using the TTL threshold to define the delivery boundaries of multicast traffic?
If a packet TTL is greater or equal to the specified TTL threshold, the packet is forwarded out of the interface
Which multicast routing protocol supports dense mode, sparse mode and bidirectional mode?
The following Cisco IOS-XR configuration command will globally enable which multicast process(es) on the router? RP/0/RP0/CPU0:router(config)# multicast-routing
PIM and IGMP and MLD
A network engineer must configure a Cisco IOS XR router with BGP dampening. Which configuration meets these parameters?
router bgp 60 address-family ipv4 unicast bgp dampening
When configuring PIM operations, what is the effect of setting the SPT threshold to infinity?
The last-hop routers will never switch over to the shortest path tree and will always remain on the shared tree
Which protocol can be used to secure multicast in a group multicast solution where group key management is needed for secure key exchange?