4A0-102 Exam Questions
113 real 4A0-102 exam questions with expert-verified answers and explanations. Page 1 of 3.
- Question #1BGP Fundamentals
Upon the successful establishment of a TCP session between peers, what type of BGP message is exchanged?
BGP session establishmentBGP message typesOpen messageTCP connection - Question #2BGP Attributes and Path Selection
Click the exhibit. An update travels from AS 135000 to AS 137000, traversing both 32-bit and 16-bit AS paths. What will the AS Path be when the update reaches AS 137000?
AS Path Construction32-bit vs 16-bit AS NumbersBGP Path AttributesAS Number Representation - Question #3BGP Fundamentals
Which of the following is FALSE regarding the 16-bit public autonomous system numbers?
ASN allocationIANA/RIR hierarchypublic ASNBGP fundamentals - Question #4BGP Fundamentals
Click the exhibit. Given that ISP 1 and ISP 2 are Tier 2 providers, and that ISP 3 and ISP 4 are Tier 1 providers, what is the most likely relationship between the ISPs?
ISP peering relationshipspublic vs private peeringTier 1 vs Tier 2 providersBGP interconnection models - Question #5BGP Attributes and Path Selection
Click the exhibit. If router A originates an update for prefix 192.168.0.1/27, what will the update contain when it reaches router B?
BGP AttributesLocally Originated PrefixesAS Path HandlingLocal Preference Defaults - Question #6BGP Fundamentals
BGP is configured on two peers, routers A and B. Router A is configured with a Hold Time timer of 60 seconds and a Keepalive timer of 25 seconds. Router B is configured with a Hold...
BGP timersHold Time negotiationKeepalive calculationTimer negotiation - Question #7BGP Fundamentals
Which of the following statements regarding the Internet is FALSE?
ISP InterconnectionPeering ModelsSettlement-Free PeeringInternet Architecture - Question #9BGP Attributes and Path Selection
What are the well-known mandatory BGP attributes?
Mandatory AttributesAS PathNext HopOrigin - Question #11BGP Attributes and Path Selection
What kind of BGP attribute is the Local Preference?
Local PreferenceBGP AttributesWell-known AttributesAttribute Classification - Question #13BGP Fundamentals
Click the exhibit. Assuming a full iBGP mesh in ISP 1, how does router R1 in ISP 1 handle a BGP update received from ISP 2?
iBGP propagationeBGP-to-iBGP update handlingfull mesh topologyroute advertisement rules - Question #14BGP Configuration
Click the exhibit. AS 65540 is using MPLS to provide BGP shortcuts for its iBGP routing. Which routers must be configured with the "configure router bgp igp-shortcuts rsvp-te" comm...
BGP shortcutsMPLS shortcutsiBGP routingRSVP-TE - Question #15BGP Fundamentals
Which of the following is TRUE if the state of one BGP neighbor shows Active?
BGP neighbor statesTCP connection establishmentBGP state machineActive state - Question #16BGP Attributes and Path Selection
Which of the following about default BGP behavior is FALSE?
BGP attributesiBGP vs eBGPattribute modificationnext hop - Question #17BGP Fundamentals
Why is a full mesh of iBGP peers required?
iBGPfull mesh topologyroute propagationsplit-horizon - Question #18BGP Configuration
Click the exhibit. Assume all router-IDs are properly configured. Which of the following configurations is required on the Alcatel-Lucent 7750 SR router A to establish an IPv6 BGP...
IPv6 BGPAddress Family ConfigurationeBGP SessionsNokia 7750 - Question #19BGP Configuration
Consider two Alcatel-Lucent 7750 SRs in AS 65540. Router R1 has system address 10.10.10.1, and router R2 has system address 10.10.10.2. Which of the following configurations on rou...
iBGP configurationlocal-addressBGP neighbor peeringBGP session establishment - Question #20BGP Fundamentals
A router in AS 65100 receives three routes for 138.120.0/16. The first route has an AS Path of 65200 65400 65300 and a local preference of 150. The second route has an AS Path of 6...
RIB-In architectureBGP route receptionLocal PreferenceAS Path - Question #21BGP Routing Policy
The user of an Alcatel-Lucent 7750 SR wants to see the effect of changing an import policy immediately. What is the best command to force re-evaluation of the import policy with mi...
BGP soft-inbound resetImport policy re-evaluationBGP neighbor managementNon-disruptive BGP operations - Question #22BGP Configuration
Click the exhibit. Assume all router-IDs are properly configured, and link-local IPv6 addresses are used to establish the eBGP-sessions. Which of the following is the MINIMAL confi...
eBGP configurationIPv6 BGPpeer-as definitionnext-hop-self behavior - Question #23BGP Routing Policy
A BGP router has loopback interfaces 192.168.1.1/27 and 192.168.2.1/27 advertised into BGP using the following export policy. The "aggregate 192.168.0.0/16" command is executed. Wh...
export-policyroute-aggregationblackhole-routesdirect-routes - Question #24BGP Attributes and Path Selection
When an Alcatel-Lucent 7750 SR receives a BGP route with an AS Path loop, what action is taken by default?
AS Path Loop DetectionRIB ArchitectureRoute InvalidationBGP Route Processing - Question #25BGP Routing Policy
What happens to a route that is rejected by an import policy on an Alcatel-Lucent 7750 SR?
Import PolicyRIB-InRoute RejectionRoute Marking - Question #26BGP Attributes and Path Selection
A router receives two routes from its neighbors: a route from OSPF for 10.0.0.0/24, and a route from BGP for 10.0.0.0/8. Both routes have reachable next hops. Which of the followin...
Longest Prefix MatchRoute Table ManagementOSPF vs BGPOverlapping Routes - Question #27BGP Configuration
Click the exhibit. AS 65550 owns CIDR block 10.64.0.0/12. Router R3 is advertising Client1 and Client2 networks into BGP. Router R6 advertises the aggregate 10.64.0.0/12 to AS 6554...
route aggregationsummary-onlyroute suppressionBGP policy - Question #28BGP Fundamentals
Which of the following prefix-lists is the most specific match for prefixes 192.168.64.1/20 and 192.168.32.5/19?
CIDR notationprefix specificityprefix matchinglongest prefix match - Question #29BGP Attributes and Path Selection
AS 65550 owns the CIDR block 10.64.0.0/12. Router R4 advertises the aggregate 10.64.0.0/12 to AS65540. Which of the following is TRUE regarding the aggregate route advertisement?
aggregate_routesaggregator_attributeatomic_aggregateBGP_attributes - Question #30BGP Routing Policy
Router R1 is advertising prefix 192.168.1.0/27 with community "no-export. Which routers will receive an update for that prefix?
BGP Communitiesno-export CommunityRoute PropagationWell-known Communities - Question #31BGP Attributes and Path Selection
An Alcatel-Lucent 7750 SR receives a route from an iBGP peer with a MED value of 500. What MED value is sent to eBGP peers?
MED attributeiBGP vs eBGPAttribute propagationBGP peer behavior - Question #32BGP Attributes and Path Selection
Router R2 receives a route to 192.168.4.0/29 from router R4 and sets the local preference to 110. Router R1 receives the route to 192.168.4.0/29 from router R3 and sets the local p...
Local PreferenceiBGP Path SelectionBGP AttributesRoute Advertisement - Question #33BGP Routing Policy
Assuming that "client1" and "client2" are directly-connected networks, what is the result of executing the following BGP export policy? entry 10 from protocol direct exit action ac...
BGP export policypolicy evaluation flowdirectly-connected routespolicy action matching - Question #34BGP Routing Policy
What is the result of configuring the following policy statement as a BGP import policy on the Alcatel-Lucent 7750 SR? policy-statement "Policy-1" entry 10 from protocol bgp prefix...
BGP import policyprefix list filteringpolicy matching logicroute filtering - Question #35BGP Attributes and Path Selection
An Alcatel-Lucent 7750 SR is configured with a local preference of 250. If it receives a BGP update with a local preference of 500, what local preference is sent to its eBGP peers?
Local PreferenceeBGP vs iBGPBGP AttributesAttribute Scope - Question #36BGP Routing Policy
Which of the following is NOT considered an option of import policies?
import policiesroute filteringlocal preferenceMED attribute - Question #37BGP Configuration
Which of the following is a valid BGP configuration for router R2?
BGP group configurationpeer-as statementeBGP configurationneighbor configuration - Question #38BGP Attributes and Path Selection
Routers C and E are route reflectors. When the update for prefix 192.168.2.0/24 is received at router F, what will be the Originator_ID attribute?
Route ReflectorsOriginator_IDBGP AttributesLoop Prevention - Question #40BGP Attributes and Path Selection
Click the exhibit. Routers RR1 and RR2 are route reflectors with the same Cluster_ID. When the update for prefix 192.168.1.0/27 is received at router RA2, what are the Originator_I...
Route ReflectorsOriginator_IDCluster_ListBGP Attributes - Question #41BGP Attributes and Path Selection
Click the exhibit. Router R6 is a route reflector with clients R1, R2 and R5 with local preferences 100, 200 and 500 respectively. Router R3 advertises prefix 192.168.1.0/27 and R2...
Route ReflectorsLocal PreferencesAdd-pathsPath Selection - Question #42BGP Routing Policy
Which of the following best describes the purpose of advertise-external?
advertise-externalroute selectioniBGP vs eBGPBGP policy - Question #43BGP Attributes and Path Selection
Click the exhibit. Router R6 is a route reflector with clients R1, R2, R4 and R5. R4 receives three routes from router R6 and is configured with ECMP 3. Given the following BGP con...
ECMPadd-pathsbackup-pathmultipath - Question #44BGP Attributes and Path Selection
Click the exhibit. Router R1 is a route reflector with clients R2, R5 and R6. Prefixes advertised by router R5 have a local preference of 200. Router R3 advertises the prefix 192.1...
Route ReflectorLocal PreferencePath Selectionadvertise-external - Question #45BGP Fundamentals
Which of the following statements regarding BGP Add-Paths is FALSE?
BGP Add-PathsBGP Capability NegotiationBGP Session EstablishmentMultipath Advertisement - Question #46BGP Configuration
Click the exhibit. Router R6 is a route reflector for clients R1, R2 and R5. Router R5 is configured with a local preference of 200. On which routers is "advertise-external" needed...
Route Reflectoradvertise-externaleBGP RoutesBGP Path Propagation - Question #47BGP Attributes and Path Selection
Click the exhibit. Router R1 is a route reflector with clients R2, R5 and R6. Router R3 advertises the prefix 192.168.1.0/27 to routers R5 and R6. Assuming that routers R1, R2 and...
Route ReflectorADD-PATHSBGP Path SelectionPath-Id - Question #48BGP Fundamentals
Which of the following statements regarding BGP control plane convergence is FALSE?
BGP convergenceFailure detectionIGP-BGP interdependencyFIB installation - Question #49BGP Configuration
Click the exhibit. Assuming router A is configured with "next-hop-self", what does the BGP update for prefix 192.168.0.1/27 contain when it arrives at router B?
next-hop-selfBGP attributesAS Pathroute advertisement - Question #50BGP Attributes and Path Selection
What kind of BGP attribute is the Multi_Exit_Disc?
Multi-Exit-DiscriminatorBGP AttributesAttribute FlagsOptional Non-Transitive - Question #51BGP Fundamentals
Which of the following organizations would an ISP based in Europe approach for an IP prefix assignment?
RIRIP allocationInternet governanceRIPE NCC - Question #52BGP Fundamentals
Which of the following is TRUE if a BGP session state is Connect?
BGP State MachineSession EstablishmentTCP ConnectionOpen Message - Question #53BGP Fundamentals
Which of the following regarding the connections between eBGP peers is TRUE?
eBGP peersBGP adjacencyautonomous systemspeer connectivity - Question #54BGP Fundamentals
Click on the exhibit. AS 65540 is using MPLS to provide BGP shortcuts for its iBGP routing. AS 65541 is advertising prefix 192.168.1.0/27 into BGP. Which routers have the BGP updat...
MPLS shortcutsiBGP propagationBGP route distributionroute advertisement filtering