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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IP Multicast | 10-15% | - Multicast integration with IGP and BGP - RPF check, multicast distribution trees, and troubleshooting - IGMPv2/v3, PIM dense mode, sparse mode, and SSM |
| Topic 2: Class of Service (CoS) | 10-15% | - CoS configuration and monitoring in service provider networks - Traffic classification, marking, and policing - Queue scheduling, shaping, and congestion management |
| Topic 3: IS-IS | 15-20% | - Configuration and monitoring for single/multi-area - DIS operation and routing policy implementation - Metrics, route summarization, and route leaking - IS-IS levels, areas, and operation |
| Topic 4: VPNs and MPLS | 20-25% | - MPLS architecture, LDP, RSVP-TE, and label switching - Layer 2 VPNs, LDP circuits, VPLS, and EVPN - Layer 3 VPNs: VRF, MP-BGP, route distinguishers, targets - VPN configuration, monitoring, and troubleshooting |
| Topic 5: OSPF | 15-20% | - LSA types, flooding, and route summarization - Single-area and multi-area configuration and monitoring - Virtual links, authentication, and routing policy - OSPFv2 and OSPFv3 concepts and operation |
| Topic 6: BGP | 20-25% | - Inter-AS routing and advanced BGP features - Attributes, communities, and multipath routing - Policy-based routing, filtering, and route manipulation - iBGP, eBGP, route reflection, and confederations |
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NEW QUESTION # 94
Which two statements are correct about IS-IS interfaces? (Choose two.)
Answer: B,D
Explanation:
IS-IS supports two levels of routing: Level 1 (intra-area) and Level 2 (interarea). An IS-IS router can be either Level 1 only, Level 2 only, or both Level 1 and Level 2. A router that is both Level 1 and Level 2 is called a Level 1-2 router. A Level 1-2 router sends separate hello messages for each level on both point-to-point and broadcast interfaces1. A point-to-point interface provides a connection between a single source and a single destination. A broadcast interface behaves as if the router is connected to a LAN.
NEW QUESTION # 95
An interface is configured with a behavior aggregate classifier and a multifield classifier How will the packet be processed when received on this interface?
Answer: D
Explanation:
Explanation
behavior aggregate (BA) classifiers and multifield (MF) classifiers are two types of classifiers that are used to assign packets to a forwarding class and a loss priority based on different criteria. The forwarding class determines the output queue for a packet. The loss priority is used by a scheduler to control packet discard during periods of congestion.
A BA classifier maps packets to a forwarding class and a loss priority based on a fixed-length field in the packet header, such as DSCP, IP precedence, MPLS EXP, or IEEE 802.1p CoS bits. A BA classifier is computationally efficient and suitable for core devices that handle high traffic volumes. A BA classifier is useful if the traffic comes from a trusted source and the CoS value in the packet header is trusted.
An MF classifier maps packets to a forwarding class and a loss priority based on multiple fields in the packet header, such as source address, destination address, protocol type, port number, or VLAN ID. An MF classifier is more flexible and granular than a BA classifier and can match packets based on complex filter rules. An MF classifier is suitable for edge devices that need to classify traffic from untrusted sources or rewrite packet headers.
You can configure both a BA classifier and an MF classifier on an interface. If you do this, the BA classification is performed first and then the MF classification. If the two classification results conflict, the MF classification result overrides the BA classification result.
Based on this information, we can infer the following statements:
* The packet will be discarded. This is not correct because the packet will not be discarded by the classifiers unless it matches a filter rule that specifies discard as an action. The classifiers only assign packets to a forwarding class and a loss priority based on their match criteria.
* The packet will be processed by the BA classifier first, then the MF classifier. This is correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
* The packet will be forwarded with no classification changes. This is not correct because the packet will be classified by both the BA classifier and the MF classifier if they are configured on an interface. The final classification result will determine which output queue and which discard policy will be applied to the packet.
* The packet will be processed by the MF classifier first, then the BA classifier. This is not correct because if both a BA classifier and an MF classifier are configured on an interface, the BA classification is performed first and then the MF classification. If they conflict, the MF classification result overrides the BA classification result.
NEW QUESTION # 96
Exhibit
Which two statements are true about the OSPF adjacency displayed in the exhibit? (Choose two.)
Answer: A,D
Explanation:
The hello interval is the time interval between two consecutive hello packets sent by an OSPF router on an interface. The dead interval is the time interval after which a neighbor is declared down if no hello packets are received from it. These parameters must match between two OSPF routers for them to form an adjacency. In the exhibit, router R1 has a hello interval of 10 seconds and a dead interval of 40 seconds, while router R2 has a hello interval of 30 seconds and a dead interval of 120 seconds. This causes a mismatch and prevents them from becoming neighbors23.
NEW QUESTION # 97
Exhibit
A network is using IS-IS for routing.
In this scenario, why are there two TLVs shown in the exhibit?
Answer: A
Explanation:
TLVs are tuples of (Type, Length, Value) that can be advertised in IS-IS packets. TLVs can carry different kinds of information in the Link State Packets (LSPs). IS-IS supports both narrow and wide metrics for link costs. Narrow metrics use a single octet to encode the link cost, while wide metrics use three octets. Narrow metrics have a maximum value of 63, while wide metrics have a maximum value of 16777215. If there are both narrow and wide metric devices in the topology, IS-IS will advertise two TLVs for each link: one with the narrow metric and one with the wide metric. This allows backward compatibility with older devices that only support narrow metrics12.
NEW QUESTION # 98
Exhibit
You want to use both links between R1 and R2 Because of the bandwidth difference between the two links, you must ensure that the links are used as much as possible.
Which action will accomplish this goal?
Answer: D
Explanation:
https://www.juniper.net/documentation/us/en/software/junos/sampling-forwarding-monitoring/bgp/topics/concep
NEW QUESTION # 99
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