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| Section | Objectives |
|---|---|
| Operations and Troubleshooting | - Troubleshooting routing and switching issues - Junos CLI monitoring tools |
| Network Services | - NAT concepts in Junos - Basic multicast concepts |
| High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Layer 2 Switching Technologies | - VLANs and trunking - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Routing Policy and Filtering | - Policy statements - Route filtering and preference control |
| Routing Protocols | - BGP fundamentals and policy control - OSPF configuration and troubleshooting - IS-IS overview |
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NEW QUESTION # 48
You are creating an aggregated Ethernet bundle using LACP on your Juniper Networks EX Series device.
In this scenario, which statement is correct?
Answer: D
Explanation:
IEEE 802.3ad LACP defines two distinct negotiation modes, active and passive, and the standard's fundamental requirement for successful negotiation is that at least one end of the point-to-point link must be configured in active mode; an actively configured device initiates LACPDU transmission on its own, while a passively configured device waits and only responds once it receives an LACPDU from its peer. If both ends of the bundle were left in passive mode simultaneously, neither side would ever initiate the exchange, and no negotiation - and therefore no functioning aggregated bundle - would ever occur; at least one active participant is therefore mandatory, though having both sides active (active-active) is also fully valid and is in fact the most common production deployment. Junos does not enable LACP automatically on aggregated Ethernet interfaces; unlike some competing platforms, LACP must be explicitly configured under the aggregated-ether-options lacp hierarchy, and specifying no LACP configuration at all results in a 'static' LAG that relies purely on physical link-state rather than any protocol negotiation - there is no implicit default active mode. There is likewise no requirement to configure differing LACP system priority values between the two peer switches; system priority is used only to determine which side of the link controls port selection during negotiation and has no bearing on whether the bundle can form. Both sides being mandatorily active is a stricter requirement than the actual standard specifies. Reference topics: Junos Enterprise Switching - Link Aggregation, LACP Active and Passive Mode Negotiation.
NEW QUESTION # 49
A recent security audit indicates that peer-to-peer applications are allowed on the guest VLAN and employees may have been using the guest VLAN for this purpose. You deploy the configuration shown in the exhibit, but it does not stop the peer-to-peer traffic.
In this scenario, what must you do to implement the security policy?
Answer: D
NEW QUESTION # 50
Which statement is correct about controlling the routes installed by a RIB group?
Answer: B
Explanation:
When routes are placed into a RIB group, an import policy can be applied to determine which routes are accepted into that group. This policy helps in controlling which routes get installed or filtered into the RIB group from various sources like other routing protocols or static routes.
https://www.juniper.net/documentation/us/en/software/junos/static-routing/topics/ref/statement/rib-groups-edit-routing-options.html
NEW QUESTION # 51
Which statement describes how Rapid Spanning Tree Protocol (RSTP) identifies an alternate port?
Answer: D
Explanation:
RSTP, as defined in IEEE 802.1w, introduces explicit, well-defined port roles that go beyond legacy 802.1D STP's simpler root/designated/blocking model, and the alternate port role is one of RSTP's key refinements.
An alternate port is a port that receives BPDUs from a bridge other than the one through which the local switch's actual root port reaches the root bridge - in other words, it represents a second, redundant path toward the root bridge learned from a different upstream bridge than the one currently providing the best (root port) path. Because the existing root port already provides the lowest-cost, actively used path to the root, the alternate port is deliberately held in the discarding (non-forwarding) state during normal, stable operation, functioning purely as a pre-computed, ready-to-use backup; critically, RSTP's major performance advantage over legacy STP is that if the current root port fails, the switch can transition its alternate port directly and almost instantly into the forwarding root port role without needing to pass through the lengthy listening and learning timer-based states that classic STP required, since the alternate port's suitability as a backup was already continuously verified through ongoing BPDU reception. It is not simply 'not receiving BPDUs' (an alternate port receives BPDUs continuously, just inferior ones relative to the current root port), it is not itself the least-cost path (that describes the root port), and it does not forward based on designated-port overload, which is not a concept that exists in RSTP's port-role logic at all. Reference topics: Junos Enterprise Switching - Spanning Tree Protocols, RSTP Port Roles: Alternate and Backup Ports.
NEW QUESTION # 52
You are asked to change the setting for the LSAs age out back to the default value. In this scenario, which time interval will accomplish this task?
Answer: C
NEW QUESTION # 53
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