Cisco 300-510 ACTUAL EXAM QUESTIONS
130 Total Questions
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130 Total Questions
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Question # 1
An engineer is troubleshooting slow performance issues on a customer’s network after the last multicast configuration change was applied on it While checking the running configuration on the router the engineer notices there are many ip igmp join-group commands applied on several interfaces of the router which caused the high CPU utilization usage. What action must the engineer take to solve this issue?
A. Configure ip igmp static-group command on all interfaces
B. Remove ip igmp join-group command on all unnecessary interfaces
C. Configure all router interfaces to be process-switched by increasing the query interval
D. Remove unnecessary members from the IGMP group
Question # 2
For which reason do you deploy BGP confederations within a BGP transit backbone?
A. to support a larger number of eBGP peer sessions
B. to increase the number of routes that can be redistributed between the running IGP and
BGP
C. to reduce the number of eBGP routes that must be shared between autonomous
systems
D. to reduce the number of iBGP peering sessions
Question # 3
Explanation: Some level of load balancing is achieved by default as BGP prefers shortest AS_PATH for certain prefix (Cisco BGP path selection algorithm - rule 4) . If 1-7 rules gives no preference for certain prefix then with rule 8. Prefer lowest IGP metric to BGP next hop we can force traffic to R2 or R3 influencing load distribution.
A. commit the configuration
B. roll back the configuration
C. merge the configuration
D. save the running configuration
Question # 4
In a PIM-SM environment, which mechanism determines the traffic that a receiver receives?
A. The receiver explicitly requests its desired traffic from the RP on the shared tree.
B. The receiver explicitly requests traffic from a single source, which responds by
forwarding all traffic.
C. The RP on the shared tree floods traffic out of all PIM configured interfaces.
D. The receiver explicitly requests traffic from each desired source, which responds by sending all traffic.
Question # 5
Which two differences should be considered when deciding whether to implement to implement routing policies or route maps? (Choose two.)
A. Sequences are added after implementing a route map, but routing policies must be reconfigured when change is needed.
B. Route maps are implemented using hierarchical policies, but routing policies must be
implemented sequentially
C. Route maps require an explicit deny at the end of the sequence, but routing policies
have an implicit deny at the end of the program.
D. Route policies require sequence numbers, but route maps are implemented without
sequencing.
E. Route maps are supported in Cisco 10S Software and routing policies are supported in
Cisco IOS XR Software.
Question # 6
A network operator working for a telecommunication company with an employee id: 4074:92:707 is planning to implement the Nonstop Forwarding (NSR) feature on the customer’s core network. After getting the configuration ready for NSR. on which router should the operator implement NSR changes?
A. on the CE router
B. on the ASBR router
C. on the ABR router
D. on the PE router
Question # 7
A network consultant is troubleshooting IS-IS instances to identify why a routing domains is having communication problems between the two instances. Which description of the possible cause of issues in the routing domain is true?
A. The same interface cannot be advertised in two different IS-IS instances
B. The IS-IS “ISP” and “ISP2” instances are unrelated and unable to intercommunicate
C. The configured IS-IS NSEL value is not allowing the routing systems to establish a
neighborship
D. The interface mode ip router is-is command was not included in the script
Question # 8
Which cost is the default when redistributing routes from BGP to OSPF?
A. 20
B. 1
C. infinite
D. automatic
Question # 9
What can be used to determine a path from the head-end to a tail-end router when implementing SR-TE with a head-end, with little information on the network topology?
A. traffic controller
B. path computation engine
C. tail-end router
D. SNMP server
Question # 10
What is the role of segment routing mapping server?
A. It advertises a local SID mapping policy to all the mapping clients.
B. It works with IGP instances to calculate the prefix-SIDs in the absence of a mapping
policy
C. It selects multiple mapping entries to create overlapping active mapping policies.
D. It reads and translates remotely received SIDs from other mapping servers to create SID
mapping entries.
Question # 11
A network engineer is troubleshooting OSPF multiarea. Which Cisco IOS XR feature should the engineer use in order to streamline OSPF issue?
A. hierarchical CLI
B. routing process enabled by default on all interfaces
C. DR support for topology management
D. show lp ospf topology command
Question # 12
You have configured routing policies on a Cisco IOS XR device with routing policy language. Which two statements about the routing policies are true? (Choose two.)
A. The routing policies affect BGP-related routes only.
B. If you make edits to an existing routing policy without pasting the full policy into the CLI,
the previous policy
is overwritten.
C. You can change an existing routing policy by editing individual statements.
D. The routing policies are implemented in a sequential manner.
E. The routing policies are implemented using route maps.
Question # 13
Which task is performed when troubleshooting LDP?
A. Execute the ping utility to generate information about the MAC addresses used along
the path
B. Verify that MPLS is disabled globally and enabled on the necessary interfaces in a perinterface basis
C. Execute the traceroute utility to generate information about the labels used along the
path
C. Execute the traceroute utility to generate information about the labels used along the
path
Question # 14
What are three requirements for a static IPv6-in-IPv4 tunnel? (Choose three.)
A. A static IPv6 address must be configured.
B. A dynamic IPv6 address must be configured.
C. Cisco Express Forwarding must be enabled.
D. Each tunnel endpoint must support IPv4 and IPv6.
E. A static IPv4 address must be configured.
F. A dynamic IPv4 address must be configured.
Question # 15
Which two conditions must be met before separate ISPs can provide interdomain multicast routing? (Choose two.)
A. Each ISP must configure MSDP to connect its individual multicast administrative domain
to the domains at other ISPs.
B. Each ISP must dedicate a single router to handle multicast traffic between providers.
C. Each ISP must replace its RP assignment with a global RP.
D. Each ISP must configure its network to use PIM-DM.
E. Each ISP must support intradomain multicast routing.
Question # 16
Which expression, when used with the as-path-set command, matches the AS path attribute of the route?
A. neighbor-is
B. dfa-regtex
C. ios-regex
D. Length
Question # 17
Which output from the show isis interface command helps an engineer troubleshoot an IS-IS adjacency problem on a Cisco IOS-XR platform?
A. metric
B. priority
C. circuit type
D. hello interval
Question # 18
What is the difference between basic IS-IS and OSPF packet types?
A. IS-IS and OSPF use area packets, but only IS-IS uses sequence number packets.
B. IS-IS and OSPF use link-state update packets, but only OSPF uses link-state ACK
packets.
C. IS-IS and OSPF use Hello packets, but only OSPF uses DBD packets.
D. IS-IS and OSPF use link-state update packets, but only IS-IS uses DBD packets.
Question # 19
What is used by SR-TE to steer traffic through the network?
A. shortest path calculated by IGP
B. dynamic rules
C. path policy
D. explicit maps
Question # 20
Which statement about BFD on Cisco IOS XR Software is true?
A. Cisco IOS XR router must use LDP to route back to the Cisco IOS router to establish the
peer relationship.
B. Cisco IOS XR Software does not support BFD multihop for IPv4.
C. Cisco IOS XR router must use dynamic routing or a static route back to the Cisco IOS
router to establish the peer relationship.
D. BFD is not compatible between Cisco IOS XR and Cisco IOS Software.
Question # 21
Which two routing protocols have extensions capable of running SRv6? (Choose two.)
A. OSPF
B. BGP
C. RIP
D. IGRP
E. EIGRP
Question # 22
Which two statements about route reflectors are true? (Choose two.)
A. Routes received from nonclient peers are reflected to route reflector clients as well as
nonclient peers.
B. Routes received from nonclient peers are reflected to route reflector cluster as well as
OSPF peers
C. If a router received an iBGP route with the originator-ID attribute set to its own router ID,
the route is discarded.
D. Routes received from a route reflector client is reflected to other clients and nonclient
peers.
E. If a route reflector receives a route with a cluster-list attribute containing a different
cluster ID, the route is discarded.
Question # 23
Which statement about enabling segment routing for IGPs is true?
A. Segment routing must first be enabled under then routing process and then globally
B. Segment routing must first be enabled globally and then under the routing process
C. Segment routing can be enabled only under the routing process
D. Segment routing can be enabled only globally
Question # 24
What are two differences between OSPF and IS-IS? (Choose two.)
A. OSPF is a link-state routing protocol, and IS-IS is a distance-vector routing protocol.
B. OSPF uses a router ID to identify a router, and IS-IS uses a system ID.
C. OSPF elects a DR and a BDR, and IS-IS elects a DIS.
D. Unlike OSPF. IS-IS supports virtual links.
E. Unlike IS-IS routers, an OSPF router belongs to only one area in addition to the backbone area.
Question # 25
What is the characteristic of enabling segment routing for IGPs?
A. Segment routing must first be enabled under the routing process and then globally.
B. Segment routing must first be enabled globally and then under the routing process.
C. Segment routing must be enabled only globally.
D. Segment routing must be enabled only under the routing process.
Question # 26
Which keyword is used with the match route-type command to redistribute the external BGP and IGP routes using route map?
A. match route-type type-1
B. match route-type nssa-external
C. match route-type type-2
D. match route-type external
Question # 27
What is the purpose of a BGP confederation?
A. It limits the number of routes a device receives from its peers, which reduces CPU load.
B. It improves service by increasing the number of simultaneous iBGP peering sessions.
C. It redirects traffic away from route reflectors, which reduces their operating load.
D. It reduces the number of iBGP peers and increases stability.
Question # 28
While configuring Cisco NSF awareness, a network engineer enters the bgp gracefulrestart command after the BGP session is established in a router that runs IOS XE Software. Graceful restart capabilities are not exchanged. Which two actions should be taken? (Choose two.)
A. Reload the router
B. Verity that BGP route dampening is configured
C. Reduce BGP convergence time
D. Issue the clear ip bgp * command
E. Issue the show ip bgp neighbors command.
Question # 29
After changing the IP address on an IOS XR router, an engineer cannot ping the new address Which step did the engineer forget to complete?
A. commit the configuration
B. roll back the configuration
C. save the running configuration
D. merge the configuration
Question # 30
Which difference should be considered when intradomain or interdomain multicast routing is implemented?
A. Interdomain multicast routing requires an IS-IS or OSPF neighbor relationship between
the domains but intradomain multicast routing requires only BGP
B. Interdomain multicast routing relies on PIM-DM and intradomain multicast routing relies
on PIM-SM.
C. interdomain multicast routing uses BIDR-PIM to establish neighbor relationships
between AS and interdomain multicast routing uses MSDP
D. A network uses intradomain multicast routing without interdomain routing but networks
that use interdomain multicast routing must also apply intradomain routing
Question # 31
A network engineer is troubleshooting OSPF multiareA. Which Cisco IOS XR feature should the engineer use in order to streamline OSPF issue?
A. hierarchical CLI
B. DR support for topology management
C. routing process enabled by default on all interfaces
D. show ip ospf topology command
Question # 32
For which reason can two BGP peers fail to establish a neighbor relationship?
A. Their BGP send-community strings are misconfigured
B. Their BGP timers are mismatched
C. Their remote-as numbers are misconfigured
D. They are both activated under an IPv4 address family
Question # 33
An engineer is troubleshooting a connectivity issue across the MPLS network and is verifying the forwarding behavior of packets. Which table does the engineer look at to verify the forwarding behavior of an IP packet as it enters the MPLS network at the ingress LSR?
A. LFIB
B. LIB
C. RIB
D. FIB
Question # 34
For which reason can two devices fail to establish an OSPF neighbor relationship?
A. The two devices have different process IDs
B. The two devices have different network types
C. The two devices have different router IDs
D. The two devices have the same area ID
Question # 35
What are two features of dual-stack? (Choose two.)
A. t is implemented without excessive processing power.
B. t supports IPv4 and IPv6 traffic on the same infrastructure.
C. t allows an engineer to stack multiple Layer 2 switches to serve as a single switching
unit.
D. t requires tunneling IPv6 traffic over an IPv4 infrastructure.
E. t securely routes and tunnels traffic between separate sites over the Internet.
Question # 36
Which command is used to enable BIDIR-PIM under global configuration mode for Cisco IOS XE Software?
A. ip pim bidir ip
B. multicast-routing
C. ipv4 pim bidir-enable
D. Ip pim bidlr-enable
Question # 37
Which feature is used in multicast routing to prevent loops?
A. STP
B. inverse ARP
C. RPF
D. split horizon
Question # 38
Which two statements about mapping multicast IP addresses to MAC addresses are true? (Choose two.)
A. All mapped multicast MAC addresses begin with 0x0100.5E
B. The router performs the mapping before it hands the packet off to a switch
B. The router performs the mapping before it hands the packet off to a switch
D. The mapping process may generate overlapping addresses, which can cause receivers
to receive unwanted packets
E. All destination MAC addresses begin with an octet of binary 1s
Question # 39
Which difference must an engineer consider when choosing whether to implement OSPF or IS-IS as the routing protocol on the network?
A. The OSPF DR election process is deterministic, and the IS-IS DS election process is not
deterministic.
B. To support fast convergence. OSPF uses the LSA arrival timer and IS-IS uses the PRCinterval timer
C. IS-IS supports ordinary, stub, totally-stub. and NSSA areas, but OSPF supports only
stub areas.
D. IS-IS links are associated with either a Level 1 area or a Level 2 area at one time, but
OSPF links are associated with multiple areas at one time.
Question # 40
What is the role of a segment routing mapping server?
A. It advertises a local SID mapping policy to all of the mapping clients
B. It works with IGP instances to calculate the prefix-SIDs in the absence of a mapping
policy
C. It selects multiple mapping entries to create overlapping active mapping policies
D. It reads and translates remotely received SIDs from other mapping servers to create SID
mapping entries
Question # 41
Which command is used to enable BIDIR-PIM under global configuration mode for Cisco IOS XE Sofware?
A. ip pim bidir-enable
B. ipv4 pim bidir-enable
C. ip multicast-routing
D. ip pim bidir
Question # 42
After an engineer configures BGP in R1, it starts receiving this message *Jun 29 13:30:50.122: %BGP-5-ADJCHANGE: neighbor 192.168.10.1 Down User reset Jun 29 13:30:52.341: %BGP-3-NOTIFICATION: sent to neighbor 192.168.10.1 2/6 (unacceptable hold time) 0 bytes Which action makes the peering come back up again?
A. Make a soft reset to the peer.
B. Set up a minimum hold-down timer higher.
C. Set up a hello timer higher.
D. Set up a hold-down timer higher.
Question # 43
What is the difference between a source tree and a shared tree in a multicast environment?
A. To route traffic from source to receiver a source tree uses a link-state routing protocol
and a shared tree uses a distance-vector routing protocol.
B. A source tree has its root at the source, and a shared tree has its root at a designated
rendezvous point.
C. To stream multicast from source to receiver, a source tree uses PIM-SM and a shared
tree uses PIM-DM.
D. Source trees are the default type for bidirectional PIM. and PIM-DM uses shared trees
by default.
Question # 44
You have configured MSDP peering between two autonomous systems that pass traffic between two sites, but the peering has failed to come up. Which task do you perform to begin troubleshooting the problem?
A. Verify that multicast has been disabled globally
B. Verify that PIM-DM is configured on the source interface
C. Verify that both source interfaces are reachable from both peers
D. Verify that the two MSDP peers allow asymmetric routing
Question # 45
Which two characteristics unique to SSM when compared to ASM are true? (Choose two.)
A. It uses SPT switchover
B. It uses (*,G) exclusively
C. It uses IGMPv3
D. It uses RP
E. It uses (S,G) exclusively
Question # 46
An engineer is working to implement segment routing protocol on the customer's core network. Which step should the engineer take before the segment routing is enabled and is running with BGP?
A. Segment routing must be configured with ISIS.
B. Segment routing must be configured with EIGRP.
C. Explicit-null must be configured for all neighbors.
D. MPLS must be configured.
Question # 47
When deploying a nationwide network of routers, what is the benefit of using BGP confederations?
A. availability
B. scalability
C. security
D. automatability