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| Section | Objectives |
|---|---|
| Topic 1: Tunnels | - Tunnel technologies |
| Topic 2: IS-IS | - IS-IS configuration and troubleshooting |
| Topic 3: BGP | - BGP configuration and troubleshooting |
| Topic 4: Layer 2 Switching or VLANs | - Native VLANs and voice VLANs - Ports and tagging - VLAN concepts and functionalities - Bridging components - Inter-VLAN routing - Configuration, monitoring, and troubleshooting - Frame processing |
| Topic 5: High Availability | - High availability design and integration - VRRP and redundancy protocols |
| Topic 6: Spanning Tree Protocol | - Convergence issues identification - Bridge priority and port cost optimization - Port roles interpretation - STP topology design and troubleshooting - Loop prevention and redundancy |
| Topic 7: OSPF | - OSPF configuration and troubleshooting |
| Topic 8: Protocol Independent Routing | - Routing fundamentals |
| Topic 9: Layer 2 Security | - Common Layer 2 attack mitigation - Dynamic ARP inspection - Port security implementation - DHCP snooping |
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NEW QUESTION # 49
You are receiving multiple BGP routes from an upstream neighbor and only want to advertise a single summarized prefix to your internal OSPF neighbors. This route should only be advertised when you are receiving these BGP routes from this neighbor.
In this scenario, which type of route should you create?
Answer: A
Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
NEW QUESTION # 50
What does the MAC limiting feature do on EX Series switches?
Answer: B
Explanation:
MAC limiting protects against flooding of the Ethernet switching table (also known as the MAC forwarding table or Layer 2 forwarding table). This feature is enabled on interfaces (ports). MAC limiting sets a limit on the number of MAC addresses that can be learned on a single Layer 2 access port. The MAC limit value in the EX-series switch's default configuration is five MAC addresses. You can configure the MAC limit on an interface, on an interface in a VLAN, or on all interfaces. You can also specify the action to be taken when the MAC limit is exceeded, such as dropping packets, logging messages, or shutting down the interface.
Additionally, you can configure specific "allowed" MAC addresses for the access port. Any MAC address that is not in the list of configured addresses is not learned. Allowed MAC binds MAC addresses to a VLAN so that the address does not get registered outside the VLAN. References:
[EX] How to control MAC address access through Junos OS for EX Series switches1 Configuring MAC Limiting2 Understanding MAC Limiting and MAC Move Limiting3
NEW QUESTION # 51
What are two purposes of an aggregate route? (Choose two.)
Answer: B,C
Explanation:
An aggregate route is a route that summarizes multiple more specific routes into a single route advertisement.
For example, an aggregate route to 10.0.0.0/8 can represent many routes to 10.x.x.x/24 subnets. An aggregate route has several purposes, such as:
To decrease the number of route advertisements: By consolidating multiple routes into one, an aggregate route reduces the size of the routing table and the amount of routing updates that need to be exchanged between routers. This can improve the scalability and efficiency of the network12.
To hide internal routes from external peers: By advertising only the aggregate route and not the more specific routes, an aggregate route can provide a level of abstraction and security for the internal network topology. This can prevent external peers from knowing the details of the internal routes and avoid potential attacks or misconfigurations13.
The other options are not correct because:
C). To allow external peers to see internal routes: This is the opposite of what an aggregate route does. An aggregate route hides the internal routes from external peers, not exposes them13.
D). To increase the number of route advertisements: This is also the opposite of what an aggregate route does. An aggregate route decreases the number of route advertisements, not increases them12.
References: Configuring Route Aggregation | Junos OS, JunOS Aggregate and Generate Routes - Network Direction, Aggregate Routes vs Generated Routes. | Junos OS - Juniper Networks
NEW QUESTION # 52
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)
Answer: A,B
Explanation:
Explanation
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device1.
A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet-switching2. The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term3.
To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer 3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks4.
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface.
Option A is incorrect, because you should not create a family ethernet-switching firewall filter with the appropriate match criteria and actions. A family ethernet-switching firewall filter is used to evaluate Layer 2 traffic on a Juniper device. A family ethernet-switching firewall filter can only match on MAC addresses or VLAN IDs, not on IP addresses or protocols5.
Option B is incorrect, because you should not apply the firewall filter to the appropriate VLAN. A VLAN is a logical grouping of hosts that share the same broadcast domain on a Layer 2 network. A VLAN does not have an IP address or routing capability. A firewall filter cannot be applied directly to a VLAN; it must be applied to an interface that belongs to or connects to the VLAN6.
References:
1: Firewall Filters Overview 2: Configuring Firewall Filters 3: Configuring Firewall Filter Match Conditions and Actions 4: Understanding Integrated Routing and Bridging Interfaces 5: Configuring Ethernet-Switching Firewall Filters 6: Understanding VLANs
NEW QUESTION # 53
Which statement correctly describes the function of a Junos OS "generated route"?
Answer: B
Explanation:
A generated route in Junos OS is a type of aggregate-like route that becomes active in the routing table only when at least one contributing (more specific) route is present. Generated routes are commonly used for route summarization, allowing an administrator to advertise a summarized prefix only when the underlying specific routes actually exist.
NEW QUESTION # 54
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