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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IP Multicast | 5-10% | - IGMP operation and configuration - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms |
| Topic 2: OSPF | 15-20% | - Route summarization and redistribution - Neighbor formation, area design and LSA types - Configuration, verification and troubleshooting |
| Topic 3: Tunnels and Overlays | 5-10% | - Overlay network design and connectivity - GRE, IP-IP and dynamic tunnel configuration - Tunnel types, encapsulation and operation |
| Topic 4: Protocol Independent Routing | 10-15% | - Routing instances and route selection criteria - Basic routing policy and filter operation - Routing tables, static routes and route preference |
| Topic 5: BGP | 15-20% | - Route advertisement, attributes and path selection - Neighbor relationships and session establishment - Routing policies, filtering and common troubleshooting |
| Topic 6: Layer 2 Security | 10-15% | - DHCP snooping, Dynamic ARP Inspection and IP Source Guard - Port security, MAC limiting and storm control - Layer 2 firewall filters and security features |
| Topic 7: IS-IS | 10-15% | - Adjacency establishment, levels and metrics - Configuration and route exchange - Scalable enterprise deployment and troubleshooting |
| Topic 8: Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - Link Aggregation Groups (LAG) and Virtual Chassis - VLAN concepts, configuration, trunking and tagging |
| Topic 9: High Availability and Resiliency | 5-10% | - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms - Network resiliency design and troubleshooting |
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NEW QUESTION # 46
A recent security audit indicates that peer-to-peer applications are allowed on the guest VLAN and employees may have been using the guest VLAN for this purpose. You deploy the configuration shown in the exhibit, but it does not stop the peer-to-peer traffic.
In this scenario, what must you do to implement the security policy?
Answer: A
NEW QUESTION # 47
What are two characteristics of RSTP alternate ports? (Choose two.)
Answer: B,C
Explanation:
A is correct because RSTP alternate ports block traffic while receiving superior BPDUs from a neighboring switch. An alternate port is a backup port for a root port, which means it receives better BPDUs from another bridge than the current root port. However, an alternate port does not forward any traffic, as it is in a discarding state. It only listens to BPDUs and waits for the root port to fail. If the root port fails, the alternate port can immediately transition to a forwarding state and become the new root port.
C is correct because RSTP alternate ports provide an alternate higher cost path to the root bridge. An alternate port is selected based on the same criteria as the root port, which are the lowest bridge ID, the lowest path cost, the lowest sender port ID, and the lowest receiver port ID.
However, an alternate port receives a higher cost BPDU than the root port, otherwise it would be the root port itself. Therefore, an alternate port provides an alternate higher cost path to the root bridge than the root port.
NEW QUESTION # 48
What is a purpose of using a spanning tree protocol?
Answer: D
Explanation:
A broadcast storm is a network condition where a large number of broadcast packets are sent and received by multiple devices, causing congestion and performance degradation. A broadcast storm can occur when there are loops in the network topology, meaning that there are multiple paths between two devices.
A spanning tree protocol is a network protocol that prevents loops from being formed when switches or bridges are interconnected via multiple paths. It does this by creating a logical tree structure that spans all the devices in the network, and disabling or blocking the links that are not part of the tree, leaving a single active path between any two devices.
By eliminating loops, a spanning tree protocol also eliminates broadcast storms, as broadcast packets will not be forwarded endlessly along the looped paths. Instead, broadcast packets will be sent only along the tree structure, reaching each device once and avoiding congestion.
NEW QUESTION # 49
Which IS-IS TLV should be used to advertise information about the router's neighbors and link metrics?
Answer: C
Explanation:
TLV 22, the Extended IS Reachability TLV defined in RFC 5305, is the modern and Junos-preferred mechanism for advertising a router's adjacent neighbors together with the metric associated with each link. It carries the seven-octet system ID and pseudonode number of each neighbor along with a 24-bit wide metric field, and supports an extensible set of sub-TLVs used for traffic-engineering data such as interface and neighbor IP addresses, bandwidth, and administrative groups. The original IS Reachability TLV, TLV 2, defined in the base ISO 10589 standard, carries similar neighbor and metric information but is constrained to a 6-bit narrow metric with a maximum value of 63, which is inadequate for expressing meaningful cost differentiation in modern, high-capacity enterprise and service-provider topologies; consequently, Junos deployments are commonly configured for wide-metrics-only, favoring TLV 22 over the legacy TLV 2 whenever traffic-engineering-capable or simply more granular metric representation is desired. TLV 132, the IP Interface Address TLV, only advertises the IPv4 addresses configured on the originating router's interfaces and carries no neighbor-adjacency or metric information. TLV 129, the Protocols Supported TLV, merely lists which network-layer protocols (such as IPv4 or IPv6) the originating router is capable of routing, and likewise has nothing to do with neighbor reachability or link cost. Reference topics: Junos Enterprise Routing
- IS-IS, Extended IS Reachability and Wide Metrics.
NEW QUESTION # 50
You are asked to connect an IP phone and a user computer using the same interface on an EX Series switch. The traffic from the computer does not use a VLAN tag, whereas the traffic from the IP phone uses a VLAN tag.
Which feature enables the interface to receive both types of traffic?
Answer: B
Explanation:
The feature that enables an interface on an EX Series switch to receive both untagged traffic (from the computer) and tagged traffic (from the IP phone) is the voice VLAN. The voice VLAN feature in EX-series switches enables access ports to accept both data (untagged) and voice (tagged) traffic and separate that traffic into different VLANs. This allows the switch to differentiate between voice and data traffic, ensuring that voice traffic can be treated with a higher priority.
NEW QUESTION # 51
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