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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Security | - Switch security features
|
| Topic 2: Tunneling Technologies | - IP tunneling
|
| Topic 3: High Availability | - Junos HA features
|
| Topic 4: Layer 2 Switching | - VLANs and trunking
|
| Topic 5: Layer 3 Routing Fundamentals | - Routing concepts
|
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NEW QUESTION # 14
You want to use filter-based forwarding (FBF) to forward traffic sourced from subnet 10.0.0.0/24 to a specific destination.
Which two routing instance types would enable you to accomplish this task? (Choose two.)
Answer: C,D
NEW QUESTION # 15
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of 192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?
Answer: B
Explanation:
In OSPF, a DR (Designated Router) and a BDR (Backup Designated Router) are elected on each multi-access network, such as Ethernet or Frame Relay. The DR and BDR are responsible for exchanging routing information with other routers on the same network segment. The election is based on two criteria: the OSPF priority and the router ID. The router with the highest priority becomes the DR, and the router with the second-highest priority becomes the BDR. If the priorities are equal, the router with the highest router ID becomes the DR, and the router with the second-highest router ID becomes the BDR. The default priority is 1, and the router ID is either manually configured or derived from the highest IP address on any interface12.
In this scenario, R1 has a priority of 32 and a router ID of 192.168.1.2, and R2 has a priority of 64 and a router ID of 192.168.1.1. Since R2 has a higher priority than R1, it will become the BDR. The router ID does not matter in this case, because the priority is different. Therefore, the correct answer is C.
The other options are not correct because:
A). At least two routers are required for a DR/BDR election, not three2.
B). Router IDs do not have to match for an adjacency to form, they just have to be unique3.
D). R1 will not be the BDR, because it has a lower priority than R212.
References: Understanding OSPF Areas | Junos OS, OSPF DR/BDR Election explained - NetworkLessons.
com, OSPF adjacency - Cisco Community
NEW QUESTION # 16
You are deploying a trunk port with multiple VLANs.
In this scenario, which statement is true about the native VLAN?
Answer: C
Explanation:
In a trunk port configuration with multiple VLANs, the native VLAN carries untagged traffic. This means frames sent or received on the port without a VLAN tag are automatically assigned to the native VLAN.
Here ' s why the other options are incorrect:
* A. The native VLAN must be the default VLAN on the port. This is not necessarily true. The native VLAN and the default VLAN can be different. The default VLAN is the VLAN assigned to untagged traffic on access ports, while the native VLAN applies to trunk ports.
* B. The native VLAN is automatically configured through DHCP. This is incorrect. The native VLAN needs to be manually configured on the switch port. DHCP is used for assigning IP addresses, not VLAN IDs.
* D. The native VLAN is the highest tagged VLAN ID on the port. This is also incorrect. The native VLAN and tagged VLANs are independent. The native VLAN is not related to the highest or lowest tagged VLAN ID.
Therefore, the only true statement is that the native VLAN is an untagged VLAN ID on the port.
:
Trunk Ports and VLANs: https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-
0_2_EX/vlan/configuration_guide/b_vlan_152ex_2960-x_cg/b_vlan_152ex_2960-x_cg_chapter_0100.pdf Configuring Trunk Ports: https://community.cisco.com/t5/networking-knowledge-base/how-to-define-the- vlans-allowed-on-a-trunk-link/ta-p/3131083 Understanding Native VLANs: https://www.practicalnetworking.net/tag/vlans/
NEW QUESTION # 17
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
Answer: D
Explanation:
The maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation is
1476 bytes. This is because GRE packets are formed by the addition of the original packets and the required GRE headers. These headers are 24-bytes in length and since these headers are added to the original frame, depending on the original size of the packet we may run into IP MTU problems. The most common IP MTU is 1500-bytes in length (Ethernet). When the tunnel is created, it deducts the 24-bytes it needs to encapsulate the passenger protocols and that is the IP MTU it will use. For example, if we are forming a tunnel over FastEthernet (IP MTU 1500) the IOS calculates the IP MTU on the tunnel as: 1500-bytes from Ethernet-24-bytes for the GRE encapsulation = 1476-Bytes.
NEW QUESTION # 18
Exhibit.
You have configured the four EX Series switches with RSTP, as shown in the exhibit. You discover that whenever a link between switches goes up or down, the switches take longer than expected for RSTP to converge, using the default settings.
In this scenario, which action would solve the delay in RSTP convergence?
Answer: B
Explanation:
* The exhibit shows the configuration of RSTP on EX-4, which has the command force-version stp
. This command forces the switch to use the legacy STP protocol instead of RSTP, even though the switch supports RSTP 1 . This means that EX-4 will not be able to take advantage of the faster convergence and enhanced features of RSTP, such as edge ports, link type, and proposal/agreement sequence 2 .
* The other switches in the network are likely to be running RSTP, as it is the default protocol for EX Series switches 3 . Therefore, there will be a compatibility issue between EX-4 and the other switches, which will result in longer convergence times and suboptimal performance. The switch will also generate a warning message that says "Warning: STP version mismatch with neighbor" when it receives a BPDU from a RSTP neighbor 1 .
* To solve this problem, the force-version command must be removed from EX-4, so that it can run RSTP natively and interoperate with the other switches in the network. This will enable faster convergence and better stability for the network topology. To remove the command, you can use the delete protocols rstp force-version command in configuration mode 1 .
NEW QUESTION # 19
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