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| Section | Objectives |
|---|---|
| Topic 1: High Availability | - VRRP and redundancy protocols - High availability design and integration |
| Topic 2: Tunnels | - Tunnel technologies |
| Topic 3: BGP | - BGP configuration and troubleshooting |
| Topic 4: Layer 2 Security | - Dynamic ARP inspection - DHCP snooping - Common Layer 2 attack mitigation - Port security implementation |
| Topic 5: Spanning Tree Protocol | - Loop prevention and redundancy - STP topology design and troubleshooting - Convergence issues identification - Bridge priority and port cost optimization - Port roles interpretation |
| Topic 6: Protocol Independent Routing | - Routing fundamentals |
| Topic 7: OSPF | - OSPF configuration and troubleshooting |
| Topic 8: Layer 2 Switching or VLANs | - Frame processing - Inter-VLAN routing - VLAN concepts and functionalities - Ports and tagging - Bridging components - Configuration, monitoring, and troubleshooting - Native VLANs and voice VLANs |
| Topic 9: IS-IS | - IS-IS configuration and troubleshooting |
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NEW QUESTION # 101
Which two statements are true about the default VLAN on Juniper switches? (Choose two.)
Answer: C,D
Explanation:
Explanation
On Juniper switches, the default VLAN is set to a VLAN ID of 1 by default12. This means that all interfaces on the switch are members of VLAN 1 until they are specifically assigned to another VLAN12. Therefore, option A is correct.
The default VLAN ID can be changed12. This allows network administrators to configure the switch to use a different VLAN as the default, if necessary12. Therefore, option D is correct.
NEW QUESTION # 102
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: C
Explanation:
Both aggregate and generated routes would work, but the best choice is generated routes.
One key difference:
With aggregated routes any prefix in the routing table counts as a contributing route.
With generated routes only prefix with a valid next-hop qualifies.
NEW QUESTION # 103
Click the Exhibit button.
Which two statements about the firewall filter terms shown in the exhibit are true? (Choose two.)
Answer: C,D
Explanation:
A firewall filter is a Junos security solution to filter or control traffic at the data plane as they enter or exit an interface 1 . A firewall filter consists of one or more terms, each with a set of conditions and actions 2 . The device evaluates every packet against the firewall filter terms in the order they are defined, and performs the actions specified in the first term that matches the packet 3 . If no term matches the packet, the device discards the packet by default 3 .
In the exhibit, the firewall filter mac-address is applied to the family ethernet-switching and involves filtering MAC addresses. There are two terms, term one and term two , each with different conditions and actions. The from statement specifies the match conditions, and the then statement specifies the actions. If the from statement is omitted, all packets are considered to match and the actions in the then statement are taken 2 . If the then statement is omitted, the packets that match the conditions in the from statement are accepted by default 2 .
* Term one logs traffic from a specific source MAC address 88:05:00:29:3c:de/48 . The log action is a nonterminating action, which means that the device continues to evaluate the packet against the remaining terms in the filter 2 . Therefore, traffic that matches the from statement in term one is not discarded, and option A is incorrect.
* Term two accepts all other traffic not specified in term one. The then accept action is a terminating action, which means that the device stops evaluating the packet against the filter and forwards the packet 2 . Therefore, all traffic not matching the from statement in term one is accepted by term two, and option D is correct.
* Term two does not have a from statement, which means that all packets are considered to match this term. Therefore, traffic matching the from statement in term two is not logged, and option B is incorrect.
* Term one does not have a then statement other than the log action, which means that the packets that match the from statement are accepted by default. Therefore, traffic that matches the from statement in term one is accepted, and option C is correct.
References:
2 : term (Firewall Filter)
3 : Firewall Filters Overview
1 : Juniper Firewall Filter Configuration Example
NEW QUESTION # 104
Which two statements are correct about link aggregation? (Choose two.)
Answer: A,D
NEW QUESTION # 105
Which two statements are correct about tunnels? (Choose two.)
Answer: A,B
Explanation:
A tunnel is a connection between two computer networks, in which data is sent from one network to another through an encrypted link. Tunnels are commonly used to secure data communications between two networks or to connect two networks that use different protocols.
Option B is correct, because tunnel endpoints must have a valid route to the remote tunnel endpoint. A tunnel endpoint is the device that initiates or terminates a tunnel connection. For a tunnel to be established, both endpoints must be able to reach each other over the underlying network. This means that they must have a valid route to the IP address of the remote endpoint 1 .
Option D is correct, because tunnels add additional overhead to packet size. Tunnels work by encapsulating packets: wrapping packets inside of other packets. This means that the original packet becomes the payload of the surrounding packet, and the surrounding packet has its own header and trailer. The header and trailer of the surrounding packet add extra bytes to the packet size, which is called overhead. Overhead can reduce the efficiency and performance of a network, as it consumes more bandwidth and processing power 2 .
Option A is incorrect, because BFD can be used to monitor tunnels. BFD is a protocol that can be used to quickly detect failures in the forwarding path between two adjacent routers or switches. BFD can be integrated with various routing protocols and link aggregation protocols to provide faster convergence and fault recovery. BFD can also be used to monitor the connectivity of tunnels, such as GRE, IPsec, or MPLS.
Option C is incorrect, because IP-IP tunnels are stateless. IP-IP tunnels are a type of tunnels that use IP as both the encapsulating and encapsulated protocol. IP-IP tunnels are simple and easy to configure, but they do not provide any security or authentication features. IP-IP tunnels are stateless, which means that they do not keep track of the state or status of the tunnel connection. Stateless tunnels do not require any signaling or negotiation between the endpoints, but they also do not provide any error detection or recovery mechanisms.
References:
1 : What is Tunneling? | Tunneling in Networking 2 : What Is Tunnel In Networking, Its Types, And Its Benefits? : [Configuring Bidirectional Forwarding Detection] : [IP-IP Tunneling]
NEW QUESTION # 106
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