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| Section | Objectives |
|---|---|
| Open Shortest Path First (OSPF) | - Identify the concepts, operation, or functionality of OSPF
|
| Spanning Tree Protocols | - Demonstrate knowledge of how to configure, monitor, or troubleshoot Spanning Tree Protocols
|
| Protocol-Independent Routing | - Demonstrate knowledge of how to configure, monitor, or troubleshoot various protocol-independent routing components
|
| Multiprotocol Label Switching (MPLS) | - Identify the concepts, operation, or functionality of MPLS CoS processing on Junos devices
|
| Border Gateway Protocol (BGP) | - Demonstrate knowledge of how to configure, monitor, or troubleshoot BGP
|
| IPv6 | - Demonstrate knowledge of how to configure, monitor, or troubleshoot IPv6 - Identify the concepts, operation, or functionality of IPv6
|
| Intermediate System to Intermediate System (IS-IS) | - Identify the concepts, operation, or functionality of IS-IS
|
| Layer 2 Bridging or VLANs | - Identify the concepts, benefits, or functionality of VLANs
|
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NEW QUESTION # 159
A BGP router receives two routes to the same prefix. One route has a higher local preference, while the other has a shorter AS path. In this scenario, which route would be selected?
Answer: A
Explanation:
TheBGP path selection algorithmis a deterministic process used by Juniper routers to select the single "best" path from the BGP table to be placed into the routing table (inet.0). This algorithm follows a specific, hierarchical set of rules. According to Juniper Networks technical documentation, the router evaluates attributes in a fixed order, and once a tie is broken at a specific step, the remaining steps are ignored.
The order of the primary BGP attributes in Junos OS is as follows:
* Highest Local Preference:This is the first attribute evaluated after the basic check for a reachable next hop. Local preference is used within an Autonomous System (AS) to prioritize one exit point over another.
* Shortest AS_PATH:If the local preference is equal, the router then evaluates the length of the AS_PATH attribute.
* Lowest Origin Code:(IGP < EGP < Incomplete).
* Lowest Multi-Exit Discriminator (MED).
In this specific scenario, the router compares a path with ahigher local preferenceagainst a path with a shorter AS path. Because theLocal Preferencecheck occurs at Step 1 and theAS_PATHcheck occurs later at Step 2, the router will select the path with the higher local preference immediately. The length of the AS path becomes irrelevant in this comparison because the tie was already broken by the local preference value.
This allows network administrators to override the default "shortest path" logic of BGP to prefer specific providers or links based on business requirements.
NEW QUESTION # 160
In an OSPF network, what is a purpose of a designated router?
Answer: D
Explanation:
On multi-access network segments, such asEthernet, OSPF could potentially face a scalability issue. If every router on a segment formed a full adjacency with every other router, the number of adjacencies would follow the formula $n(n-1)/2$. In a segment with 10 routers, this would result in 45 adjacencies, each generating redundant flooding of Link-State Advertisements (LSAs) and excessive Hello traffic.
To solve this, OSPF elects aDesignated Router (DR)and aBackup Designated Router (BDR). According to Juniper Networks documentation, the primary purpose of the DR is to act as a central point of contact for the segment, therebyreducing OSPF traffic (Option C).
Instead of every router syncing with every other router, they all form aFull adjacencyonly with the DR and BDR. When a router (a DR-Other) has an update, it sends it to the multicast address224.0.0.6(All DR Routers). The DR then acknowledges the update and floods it to all other routers on the segment using the multicast address224.0.0.5(All OSPF Routers). This "hub-and-spoke" signaling model within the local segment significantly minimizes the bandwidth consumed by protocol overhead and reduces the CPU load on the participating routers.
It is important to note that the DR's scope is limited to the local segment; it does not "assign IDs" (Option A) nor does it flood routes to the "entire domain" (Option D), as that is the responsibility of individual routers within their respective areas.
NEW QUESTION # 161
You are using EBGP to connect to two upstream peers in the same AS. You want to make one of the links less preferred for traffic entering your network from the peer's AS. Which feature should you use to achieve this goal?
Answer: A
Explanation:
In the world of BGP, controllinginbound traffic(traffic entering your network) is significantly more challenging than controlling outbound traffic because it requires influencing a decision made by an external Autonomous System (AS). According to Juniper Networks documentation, when you have multiple links to the same AS or even different ASes, the BGP path selection process is used by the upstream neighbor to decide which path to take to reach your prefixes.
AS-Path Prependingis the standard technique used to make a path appear less attractive to external peers. By artificially lengthening the AS_PATH attribute on the BGP advertisements sent over a specific link, you exploit the BGP best-path algorithm rule that prefers a shorter AS path. When you prepend your own AS number multiple times to the update sent to the "less preferred" peer, that peer's BGP routers will see a longer path compared to the alternative link and will naturally prefer the shorter, unprepended route.
It is important to distinguish why other options are incorrect for this specific goal:
* Local Preference (Option D):This is a well-known discretionary attribute used to influenceoutbound traffic. It is not advertised to EBGP peers; therefore, your upstream neighbor cannot see your local preference settings.
* Origin Code (Option B):While the origin code (IGP, EGP, or Incomplete) is a tie-breaker in the selection process, it is rarely used for traffic engineering and lacks the granular control provided by prepending.
* Route Reflector (Option A):This is an Internal BGP (IBGP) scaling mechanism used to reduce the need for a full mesh of peers within an AS; it does not directly influence external path selection by an upstream provider.
Junos OS allows you to easily implement prepending viarouting policiesapplied as an "export" policy to the EBGP neighbor. By using the as-path-prepend action within a policy term, you can selectively degrade a path's attractiveness to manage your inbound bandwidth.
NEW QUESTION # 162
Referring to the exhibit. Routers R1 and R4 have a VRRP priority of 90, while R2 and R3 have default VRRP priorities Referring to the exhibit, which router will be elected as the primary VRRP router?
Answer: A
Explanation:
In a VRRP (Virtual Router Redundancy Protocol) configuration, the router with the highest priority is elected as the primary (master) router. If two or more routers have the same highest priority, the one with the highest IP address is elected.
Default VRRP priority is 100.
From the question:
- R1 and R4 have a priority of 90.
- R2 and R3 have default priority (100).
Since R2 and R3 both have the highest priority (100), VRRP will elect the one with the higher IP address as the master.
- R2: 203.0.113.2
- R3: 203.0.113.3 → higher IP
NEW QUESTION # 163
Click the Exhibit button. You must configure the router called ROUTER_1 to take all valid prefixes learned from internal BGP peers in AS 64523, and then re-advertise them to other internal BGP peers in the same autonomous system.
Referring to the exhibit, which configuration must you deploy on ROUTER_1 to accomplish this task?
Answer: B
Explanation:
To re-advertise routes learned from iBGP peers to other iBGP peers within the same AS, ROUTER_1 must act as a route reflector. On Junos, enabling route reflection is done by configuring a cluster ID under the internal BGP group. The cluster ID uniquely identifies the route- reflector cluster and allows ROUTER_1 to reflect iBGP-learned routes to its other iBGP neighbors.
NEW QUESTION # 164
......
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