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| Section | Objectives |
|---|---|
| Protocol-Independent Routing | - Load balancing and filter-based forwarding - Static, aggregate, generated routes - Martian addresses and RIB groups |
| Layer 2 Security | - BPDU, loop and root protection - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters |
| Layer 2 Switching and VLANs | - Inter-VLAN routing - Ports and VLAN tagging - Native VLANs and voice VLANs - Frame processing - Bridging components |
| IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| High Availability | - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD - Virtual chassis and graceful restart |
| BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Spanning Tree | - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states - Convergence and reconvergence |
| OSPF | - Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors |
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NEW QUESTION # 91
You are configuring an IS-IS IGP network and do not see the IS-IS adjacencies established. In this scenario, what are two reasons for this problem? (Choose two.)
Answer: C,D
Explanation:
Option A suggests that the MTU is not at least 1492 bytes. This is correct because IS-IS requires a minimum MTU of 1492 bytes to establish adjacencies. If the MTU is less than this, IS-IS adjacencies will not be established.
Option D suggests that the lo0 interface is not included as an IS-IS interface. This is also correct because the loopback interface (lo0) is typically used as the router ID in IS-IS. If the loopback interface is not included in IS-IS, it could prevent IS-IS adjacencies from being established.
NEW QUESTION # 92
You have configured OSPF routing as shown in the exhibit. You notice that all interfaces have formed full adjacencies, with the exception of the interfaces connecting R3 and R4 with a status of 2Way.
What is the reason for this status?
Answer: C
NEW QUESTION # 93
You are troubleshooting a BGP routing issue between your network and a customer router and are reviewing the BGP routing policies. Which two statements are correct in this scenario?
(Choose two.)
Answer: C,D
Explanation:
In BGP, routing policies are used to control the flow of routing information between BGP peers.
Option C suggests that import policies are applied after the RIB-In table. This is correct because import policies in BGP are applied to routes that are received from a BGP peer, before they are installed in the local BGP Routing Information Base (RIB-In). The RIB-In is a database that stores all the routes that are received from all peers.
Option D suggests that export policies are applied after the RIB-Local table. This is correct because export policies in BGP are applied to routes that are being advertised to a BGP peer, after they have been selected from the local BGP Routing Information Base (RIB-Local). The RIB-Local is a database that stores all the routes that the local router is using.
NEW QUESTION # 94
What is the maximum allowable MTU size for a default GRE tunnel without IPv4 traffic fragmentation?
Answer: C
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 # 95
Which two statements are true about routing instances on Junos devices? (Choose two.)
Answer: C,D
Explanation:
The virtual-router routing-instance type in Junos is a general-purpose instance type intended for creating isolated, independent routing and forwarding contexts within a single physical device for applications that have nothing to do with MPLS-based VPN services - common use cases include multi-tenant network segmentation, filter-based forwarding deployments, and simple traffic isolation between departments or customers on a shared switch or router, all of which are non-VPN-related applications by nature. Layer 2 and Layer 3 VPN services, by contrast, rely on a different, dedicated routing-instance type specifically named vrf, which integrates with MPLS/BGP-based VPN signaling, route distinguishers, route targets, and PE-CE routing exchange; virtual-router instances do not participate in that VPN signaling framework at all, which is why the statement associating virtual-router with VPN use is incorrect. Whenever an administrator creates any user-configured routing instance - regardless of its specific type - Junos automatically allocates and generates a brand-new, dedicated routing table for that instance, named according to the pattern instance- name.inet.0 (or the appropriate address-family suffix), which is entirely separate from and independent of the default master inet.0 table used by the global/default routing context. Because each new routing instance receives its own distinct table rather than sharing or defaulting into the master inet.0 table, the statement claiming instances automatically fall back to using inet.0 unless configured otherwise is factually incorrect; instances are isolated by design from the outset. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Routing Instance Types and Table Allocation.
NEW QUESTION # 96
......
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