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| Section | Objectives |
|---|---|
| Layer 3 Routing Fundamentals | - Routing concepts
|
| Layer 2 Security | - Switch security features
|
| High Availability | - Redundancy mechanisms
|
| Tunneling Technologies | - IP tunneling
|
| Layer 2 Switching | - VLANs and trunking
|
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NEW QUESTION # 25
Which statement correctly describes the purpose of the Junos OS "graceful restart" feature?
Answer: D
Explanation:
Graceful restart allows a router experiencing a Routing Engine restart or switchover (such as in a dual Routing Engine or high availability scenario) to continue forwarding traffic based on its existing forwarding table while routing protocol adjacencies are re-established, minimizing traffic disruption during the recovery process.
NEW QUESTION # 26
Which two statements are correct about tunnels? (Choose two.)
Answer: A,D
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 # 27
Two routers share the same highest priority and start time. In this situation, what is evaluated next when determining the designated router?
Answer: C
Explanation:
According to the OSPF protocol, the designated router (DR) is the router that acts as the focal point for exchanging routing information on a multi-access network segment, such as a LAN. The DR election process is based on the following criteria, in order of precedence:
The router with the highest OSPF priority becomes the DR. The default priority is 1, and a priority of 0 means the router will not participate in the election.
If there is a tie in priority, the router with the highest router ID becomes the DR. The router ID is a
32-bit number that uniquely identifies a router in an OSPF domain. It can be manually configured or automatically derived from the highest IP address of a loopback interface or a physical interface. If there is a tie in router ID, the router that was first to become an OSPF neighbor becomes the DR. In your scenario, two routers share the same highest priority and start time.
This means that they have equal chances of becoming the DR based on the first and third criteria. Therefore, the second criterion will be used to break the tie, which is the router ID. The router with the highest router ID will become the DR, and the other router will become the backup designated router (BDR), which is ready to take over the role of DR if it fails.
NEW QUESTION # 28
Which statement correctly describes the purpose of BPDU protection in Junos OS?
Answer: C
Explanation:
BPDU protection is applied to edge ports (ports expected to connect only to end hosts) to guard against unauthorized or rogue switches being connected. If a BPDU is received on a protected edge port, the port is automatically disabled, preventing potential spanning tree topology changes caused by unauthorized devices.
NEW QUESTION # 29
You are concerned about spoofed MAC addresses on your LAN.
Which two Layer 2 security features should you enable to minimize this concern? (Choose two.)
Answer: A,B
Explanation:
* A is correct because dynamic ARP inspection (DAI) is a Layer 2 security feature that prevents ARP spoofing attacks. ARP spoofing is a technique that allows an attacker to send fake ARP messages to associate a spoofed MAC address with a legitimate IP address. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DAI validates ARP packets by checking the source MAC address and IP address against a trusted database, which is usually built by DHCP snooping 1 . DAI discards any ARP packets that do not match the database or have invalid formats 1 .
* C is correct because DHCP snooping is a Layer 2 security feature that prevents DHCP spoofing attacks. DHCP spoofing is a technique that allows an attacker to act as a rogue DHCP server and offer fake IP addresses and other network parameters to unsuspecting clients. This can result in traffic redirection, man-in-the-middle attacks, or denial-of-service attacks. DHCP snooping filters DHCP messages by classifying switch ports as trusted or untrusted. Trusted ports are allowed to send and receive any DHCP messages, while untrusted ports are allowed to send only DHCP requests and receive only valid DHCP replies from trusted ports 2 . DHCP snooping also builds a database of MAC addresses, IP addresses, lease times, and binding types for each client 2 .
NEW QUESTION # 30
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