4A0-102 - Alcatel-Lucent Border Gateway Protocol
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What will happen if an update is received with an unrecognized optional non-transitive attribute?
The router will accept the update and ignore the attribute.
Which of the following is NOT considered an option of export policies?
Preventing unwanted NLRI from entering the AS.
Which of the following regarding BGP Path Identifier is FALSE?
Path-ID is an optional transitive attribute used to advertise multiple paths.
Which of the following best describes the purpose of advertise-external?
It enables a BGP speaker to advertise its best external route to iBGP peers when the bestoverall route is internal.
Which of the following statements about an autonomous system is FALSE?
An AS efficiently advertises all IGP known routes to other ASs.
What is the function of the Cluster_List attribute?
It is used for loop detection between clusters.
Which of the following AS Paths will match the regular expression "65100."?
Which of the following is TRUE if a BGP session state is Connect?
BGP has established a TCP connection, and an Open message has been sent to that neighbor.
Which of the following routes is NOT considered an internal route?
A route received from a BGP peer from a different member AS of a confederation.
Which of the following regarding BGP authentication on the Alcatel-Lucent 7750 SR is FALSE?
Authentication can only be configuredon the group or neighbor level.
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?
Which of the following statements regarding BGP route selection is TRUE?
Lower BGP router ID is preferred over higher BGP router ID.
Which of the following statements regarding route reflectors is TRUE?
Route reflectors propagate BGP learned routes to their clients.
Which of the following statements regarding BGP shortcuts is FALSE?
Edge and transit routers need to be configured with BGP.
Which of the following is NOT a BGP message type?
Which of the following is FALSE regarding the 16-bit public autonomous system numbers?
They are assigned by the ISPs for enterprise networks.
An autonomous system has 7 routers configured with BGP. How many iBGP sessions are required for a fully meshed configuration?
An Alcatel-Lucent 7750 SR receives a route from an eBGP peer with a MED value of 500. What MED value is sent to iBGP peers?
A confederated AS is comprised of three members. One member is comprised of 4 routers, while the other two members are comprised of 3 routers each. Assuming member ASs are fully meshed and use full mesh iBGP, what is the required number of BGP sessions within the confederation?
Which of the following statements regarding the Internet is FALSE?
It is a settlement-free global network that provides interconnection between Internet serviceproviders.
Which of the following is NOT a goal of BGP routing policies?
To communicate the architecture of an AS to external ASs.
Which of the following about a single-homed AS is FALSE?
A single-homed AS can be either transit or non-transit
What kind of BGP attribute is the Multi_Exit_Disc?
Optional non-transitive attribute.
Which of the following prefix-lists is the most specific match for prefixes 192.168.64.1/20 and 192.168.32.5/19?
Prefix 192.168.0.0/17 longer.
A router in AS 65100 receives three routes for 188.8.131.52/16. 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 65200 65300 and a local preference of 100. The third route has an AS path of 65600 65300 and a local preference of 200. Which route will appear in the RIB-In?
All routes will appear in the RIB-In.
Which of the following regarding the TTL of a BGP message is TRUE?
The default TTL value of an eBGP message is 1, and 64 for an iBGP message.
A BGP session is in OpenConfirm state. Which of the following messages must be received to transition to Established state?
Why is a full mesh of iBGP peers required?
To ensure proper route propagation inside a transit AS.
What kind of BGP attribute is the Local Preference?
Well-known discretionary attribute.
Which of the following about default BGP behavior is FALSE?
Next Hop is modified in iBGP updates.
How is the aggregator attribute handled with 32-bit AS numbers?
With the same method as 16-bit AS numbers, but using the AS4_Aggregator attribute.
Which of the following regarding the atomic aggregate attribute is TRUE?
The atomic aggregate flag is always set if the AS Path information is lost due to aggregation.
When implementing a BGP policy on an Alcatel-Lucent 7750 SR, which of the following types of address space would a typical address plan need to cover?
All of the above.
Which of the following best describes the relationship between locally configured policies and the direction of traffic?
Import policies affect the way the local AS sends traffic, while export policies affect the way itreceives traffic.
An Alcatel-Lucent 7750 SR receives a route from an eBGP peer without a MED. What MED value is sent to iBGP peers?
Which of the following statements regarding BGP control plane convergence is FALSE?
BGP control plane convergence is independent of number of affected prefixes.
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 following is TRUE?
Both routes are in the route table.
Which of the following regarding the withdrawal of routes from one BGP speaker to another is TRUE?
An update message is used. Multiple prefixes can be withdrawn at a time.
When an Alcatel-Lucent 7750 SR receives a BGP route with an AS Path loop, what action is taken by default?
The route is flagged as invalid and placed in the RIB-In.
Which of the following regarding BGP confederations is FALSE?
Member ASs must be fully meshed within a confederation.
Based on the default settings for the Alcatel-Lucent 7750 SR, when a policy change is made and committed, what action is required by the user for the change to take effect?
No further action is required.
Which of the following is considered a best practice for BGP address planning?
Using system addresses for setting up iBGP sessions.
Which of the following behaviors regarding the modification of BGP attributes within a confederation is TRUE?
AS Path is modified when crossing member AS boundaries within a confederation.
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 minimal impact?
Clear router bgp neighbor <ip-address> soft-inbound
A router in AS 65100 receives three routes for 184.108.40.206/16. 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 65200 65300 and a local preference of 100. The third route has an AS Path of 65600 65300 and a local preference of 100. Which route will appear in the RIB-out?
Only the first route will appear in the RIB-Out.
Which of the following is TRUE if the local state of BGP is OpenConfirm?
The local system has sent a Keepalive message to its neighbor and is waiting to receive oneback.
Which of the following is TRUE if the state of one BGP neighbor shows Active?
The router is trying to initiate a TCP connection to that neighbor.
Which of the following commands would correctly configure the confederation AS number as 65200 with a member AS of 65202?
config>router- confederation 65200 members 65202
Which of the following describes BGP route processing on the Alcatel-Lucent 7750 SR?
If no import policy is specified, all valid BGP routes are passed to the BGP route selectionprocess.
Upon the successful establishment of a TCP session between peers, what type of BGP message is exchanged?