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| Section | Objectives |
|---|---|
| OSPF | - OSPF configuration and troubleshooting |
| Layer 2 Security | - Port security implementation - DHCP snooping - Dynamic ARP inspection - Common Layer 2 attack mitigation |
| Protocol Independent Routing | - Routing fundamentals |
| Tunnels | - Tunnel technologies |
| Spanning Tree Protocol | - Convergence issues identification - Bridge priority and port cost optimization - STP topology design and troubleshooting - Loop prevention and redundancy - Port roles interpretation |
| High Availability | - High availability design and integration - VRRP and redundancy protocols |
| BGP | - BGP configuration and troubleshooting |
| Layer 2 Switching or VLANs | - Ports and tagging - Configuration, monitoring, and troubleshooting - Inter-VLAN routing - Native VLANs and voice VLANs - Bridging components - VLAN concepts and functionalities - Frame processing |
| IS-IS | - IS-IS configuration and troubleshooting |
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NEW QUESTION # 169
Which two statements are correct about the Junos OS "load balancing" per-packet feature using an equal-cost multipath (ECMP) policy? (Choose two.)
Answer: C,D
Explanation:
Equal-cost multipath (ECMP) allows traffic to be distributed across multiple paths of equal cost toward the same destination, improving link utilization and providing redundancy. In Junos OS, a routing policy with the "load-balance per-packet" action must typically be applied to the forwarding table to enable this per-flow (or per-packet) load balancing behavior across the equal-cost paths, and ECMP can be used with multiple protocols, including OSPF and BGP.
NEW QUESTION # 170
An update to your organization's network security requirements document requires management traffic to be isolated in a non-default routing-instance. You want to implement this requirement on your Junos-based devices.
Which two commands enable this behavior? (Choose two.)
Answer: B,D
Explanation:
Explanation
To isolate management traffic in a non-default routing-instance on Junos-based devices, you can use the set system management-instance and set routing-instances mgmt_junos commands12.
set system management-instance: This command associates the management interface (usually named fxp0 or em0 for Junos OS, or re0:mgmt-* or re1:mgmt-* for Junos OS Evolved) with the non-default virtual routing and forwarding (VRF) instance1. After you configure the non-default management VRF instance, management traffic no longer has to share a routing table with other control traffic or protocol traffic1.
set routing-instances mgmt_junos: This command creates a new routing instance named mgmt_junos. The name of the dedicated management VRF instance is reserved and hardcoded as mgmt_junos; you cannot configure any other routing instance by the name mgmt_junos1.
Therefore, options C and D are correct. Options A and B are not correct because they attempt to assign an interface to the mgmt_junos routing instance, which is not necessary for isolating management traffic1.
NEW QUESTION # 171
Click the Exhibit button.
You want to redistribute the static routes into BGP, but they do not show as BGP routes.
What causes this result to occur?
Answer: D
Explanation:
The static route to the 0.0.0.0/0 network has a next hop of xe-0/0/0.0, which is a local interface. BGP does not accept static routes with a local interface as the next hop, because it cannot advertise them to other BGP peers.
BGP requires a valid IP address as the next hop for static routes that are redistributed into BGP. To fix this issue, the static route should have a next hop of an IP address that is reachable via the xe-0/0/0.0 interface, such as the IP address of the eBGP neighbor. Alternatively, the next hop can be modified by using a route map when redistributing the static route into BGP12.
The other options are not correct because:
The as-path parameter is not required for redistributing static routes into BGP. The as-path attribute is automatically set by BGP when advertising routes to other BGP peers3.
A community string is not required for redistributing static routes into BGP. A community is an optional attribute that can be used to group routes and apply policies to them4.
The no-readvertise feature is not specified in the configuration. The no-readvertise feature is used to prevent routes learned from one iBGP peer from being advertised to another iBGP peer5.
References:
How to configure BGP to send the default route to a neighbor
Redistributing Static Route in to BGP - Cisco Community
BGP Fundamentals
BGP Communities Attribute
BGP No-Readvertise Feature
NEW QUESTION # 172
Exhibit
What does the * indicate in the output shown in the exhibit?
Answer: B
Explanation:
The exhibit shows the output of the command show vlans brief, which displays brief information about VLANs and their associated interfaces1.
The output has four columns: Routing instance, VLAN name, Interfaces, and Tagging.
The * symbol indicates that the interface is active, meaning that it is up and forwarding traffic1. This can be verified by the command , which displays the status of the interfaces2.
NEW QUESTION # 173
Exhibit
Referring to the exhibit, which statement is correct?
Answer: A
Explanation:
Explanation
In a Rapid Spanning Tree Protocol (RSTP) topology, the root bridge is determined by the switch with the lowest bridge priority value12. If all switches have the same priority, then the root bridge is assigned to the switch whose MAC address's hex value is the lowest2. The default bridge priority value is 3276832. However, without the actual exhibit, it's difficult to definitively determine which device is the root bridge. But based on the options provided, if we assume that the local device has a lower bridge priority or a lower MAC address than other devices in the network, then it could be considered as the root bridge for this RSTP topology45.
NEW QUESTION # 174
......
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