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| Section | Weight | Objectives |
|---|---|---|
| Protocol Independent Routing | 10-15% | - Basic routing policy and filter operation - Routing tables, static routes and route preference - Routing instances and route selection criteria |
| BGP | 15-20% | - Route advertisement, attributes and path selection - Routing policies, filtering and common troubleshooting - Neighbor relationships and session establishment |
| OSPF | 15-20% | - Route summarization and redistribution - Configuration, verification and troubleshooting - Neighbor formation, area design and LSA types |
| Tunnels and Overlays | 5-10% | - GRE, IP-IP and dynamic tunnel configuration - Overlay network design and connectivity - Tunnel types, encapsulation and operation |
| Layer 2 Switching and VLANs | 15-20% | - Spanning Tree Protocol (STP, RSTP, MSTP) operation and configuration - VLAN concepts, configuration, trunking and tagging - Link Aggregation Groups (LAG) and Virtual Chassis |
| IP Multicast | 5-10% | - Multicast routing monitoring and troubleshooting - PIM Dense Mode, Sparse Mode and RP mechanisms - IGMP operation and configuration |
| High Availability and Resiliency | 5-10% | - Network resiliency design and troubleshooting - Graceful restart and non-stop routing - Redundancy protocols and failover mechanisms |
| IS-IS | 10-15% | - Configuration and route exchange - Scalable enterprise deployment and troubleshooting - Adjacency establishment, levels and metrics |
| 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 |
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NEW QUESTION # 160
Referring to the exhibit, which router will become the OSPF BDR if all routers are powered on at the same time?
Answer: D
Explanation:
Priority set to 0 will never become DR or BDR so R1 is excluded.
Higher priority is better in OSPF so R2 is lowest than both R3 and R4.
R3 and R4 has the same priority so RID will decide.
R4 has the highest RID so it will become DR and R3 will then become BDR.
NEW QUESTION # 161
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure.
By default, what impact will this failure have on traffic forwarding between the switches?
Answer: D
Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating.
When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link- status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors - full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation - reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption. Reference topics: Junos Enterprise Switching - Layer 2 Switching, Link Aggregation Group Resiliency.
NEW QUESTION # 162
What are three valid OSPF adjacency states? (Choose three.)
Answer: A,B,C
Explanation:
OSPF neighbor state progression, as defined in RFC 2328 and displayed by Junos through show ospf neighbor, moves through a well-defined set of named states: Down, Attempt, Init, 2-Way, ExStart, Exchange, Loading, and Full. Down is the initial state, indicating no Hello packets have been recently received from a potential neighbor on that interface; it is a genuine, valid OSPF state and is correctly included here. Init indicates that a Hello packet has been received from the neighbor, but that neighbor has not yet listed the local router's own router ID within its Hello packet, so bidirectional communication has not yet been confirmed; this too is a standard, valid state. Loading occurs after the Exchange state, during which Database Description packets have been fully exchanged and the router is now actively requesting the specific, more-detailed LSAs it identified as missing or outdated from its neighbor via Link State Request packets; it is likewise a standard, valid OSPF neighbor state. 'Established' is not an OSPF state at all -- that terminology belongs to BGP's finite state machine, where Established represents the fully operational session state; the OSPF equivalent concept is instead called Full. 'Reject' is not a recognized OSPF neighbor state under any circumstance and does not appear anywhere in the RFC 2328 state machine, making it an invalid distractor as well.
NEW QUESTION # 163
How many bytes of overhead does an IP-IP tunnel add to a packet?
Answer: C
NEW QUESTION # 164
Two Juniper Networks EX Series Switches are connected with four 1-GbE links configured as a single link aggregation group (LAG). One of the physical member links experiences a failure. By default, what impact will this failure have on traffic forwarding between the switches?
Answer: D
Explanation:
A link aggregation group bundles multiple physical Ethernet links into a single logical interface (an ae interface) specifically to provide both increased aggregate bandwidth and link-level redundancy. By default, the aeX interface remains operationally up as long as at least one member link within the bundle remains active and passing traffic; the LAG does not require every member link to be functional to continue operating. When one of the four 1-GbE member links in this scenario fails, LACP (if in use) or the underlying link-status monitoring detects the failure, removes that specific link from the active forwarding set, and redistributes traffic hashing across the three remaining healthy member links automatically and without operator intervention. End devices and upper-layer protocols continue to see a single, continuously up ae interface throughout this process, experiencing only a proportional reduction in available aggregate bandwidth rather than any interruption in connectivity. This default behavior is precisely why LAG is a foundational building block for resilient EX Series switch interconnects in enterprise and data center designs, since it allows individual optic, cable, or transceiver failures to be absorbed transparently. None of the distractor behaviors -- full administrative shutdown of the bundle, forwarding limited to broadcast traffic only, or a temporary disabling of all member links during renegotiation -- reflect actual Junos LAG behavior, which is designed explicitly to avoid any such disruption.
NEW QUESTION # 165
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