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| Section | Objectives |
|---|---|
| Topic 1: Spanning Tree | - Bridge Protocol Data Units (BPDUs) - Convergence and reconvergence - STP and RSTP concepts, roles and states |
| Topic 2: BGP | - BGP basic operations and message types - Attributes and path selection - EBGP and IBGP peer interactions |
| Topic 3: Layer 2 Switching and VLANs | - Ports and VLAN tagging - Frame processing - Bridging components - Native VLANs and voice VLANs - Inter-VLAN routing |
| Topic 4: Layer 2 Security | - MACsec and storm control - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters - BPDU, loop and root protection |
| Topic 5: High Availability | - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG - Virtual chassis and graceful restart |
| Topic 6: Protocol-Independent Routing | - Static, aggregate, generated routes - Load balancing and filter-based forwarding - Martian addresses and RIB groups |
| Topic 7: Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Topic 8: OSPF | - Router ID, adjacencies and neighbors - Link-state database and packet types - Areas and LSA types |
| Topic 9: IS-IS | - Adjacencies and troubleshooting - Levels, areas and metrics - Link-state database and PDUs |
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NEW QUESTION # 140
Referring to the exhibit, which two statements about BGP prefixes advertised by R1 to AS 65501 are true? (Choose two.)
Answer: A,C
NEW QUESTION # 141
Which two statements are correct about VRRP? (Choose two.)
Answer: C,D
Explanation:
The virtual IP address must match on all participating devices - All routers in the same VRRP group must be configured with the same virtual IP address to provide redundancy.
The VRRP group number must match on all participating devices - All routers in the same VRRP group must have the same group number to identify the VRRP group.
NEW QUESTION # 142
Which statement describes the purpose of an integrated routing and bridging (IRB) interface on a Juniper Networks EX Series Switch?
Answer: B
Explanation:
An integrated routing and bridging interface, configured as irb.x on an EX Series switch, is the mechanism that bridges the Layer 2 and Layer 3 forwarding planes for a given bridge domain or VLAN. By assigning an irb logical unit to a VLAN and configuring an IP address on that unit, the switch gains a routable Layer 3 gateway address that hosts within that VLAN can use as their default gateway, enabling traffic destined for other subnets to be routed off the local broadcast domain. Internally, when a frame destined for the gateway's MAC address arrives on any port belonging to that VLAN, the switch's integrated circuitry hands the packet from the Layer 2 bridging domain to the Layer 3 routing engine associated with the corresponding irb interface, and vice versa for the return path - hence the name 'integrated routing and bridging.' IRB does not eliminate the need for routing instances, which remain a separate mechanism for isolating routing tables; it does not itself perform inter-VLAN switching, since switching still happens strictly within a VLAN's own broadcast domain; and it has no relationship to trunk ports, which remain necessary for carrying multiple tagged VLANs between switches. IRB is the standard method for enabling inter-VLAN routing on a single EX Series switch without an external router. Reference topics: Junos Enterprise Switching - Routing VLANs, Configuring Integrated Routing and Bridging.
NEW QUESTION # 143
Which two statements are correct about using firewall filters on EX Series switches? (Choose two.)
Answer: B,D
Explanation:
A is correct because you can deploy only stateless firewall filters on an EX Series switch. A stateless firewall filter is a filter that evaluates each packet individually based on the header information, such as source and destination addresses, protocol, and port numbers. A stateless firewall filter does not keep track of the state or context of a packet flow, such as the sequence number, flags, or session information. EX Series switches support only stateless firewall filters, which are also called access control lists (ACLs) or packet filters.
C is correct because you can apply firewall filters to both Layer 2 and Layer 3 traffic on an EX Series switch. Layer 2 traffic is traffic that is switched within a VLAN or a bridge domain, while Layer 3 traffic is traffic that is routed between VLANs or networks. EX Series switches support three types of firewall filters: port (Layer 2) firewall filters, VLAN firewall filters, and router (Layer
3) firewall filters. You can apply these filters to different interfaces and directions to control the traffic entering or exiting the switch.
NEW QUESTION # 144
Which two statements describe the purpose of a BGP notification message? (Choose two.)
Answer: A,C
Explanation:
A BGP NOTIFICATION message is one of the four core message types defined in RFC 4271, alongside OPEN, UPDATE, and KEEPALIVE, and it serves a very specific and narrow purpose within the protocol: whenever a BGP speaker detects an unrecoverable, fatal condition in the session -- such as a malformed OPEN message, an unsupported capability, a hold-timer expiration, a finite-state-machine error, or an administratively initiated reset -- it transmits a NOTIFICATION message to its peer immediately before closing the underlying TCP connection and tearing down the session entirely. This confirms that a NOTIFICATION always signals the termination of the session upon a fatal error, never a routine, in-session update. Structurally, every NOTIFICATION message carries a defined error code and error subcode field, which together precisely classify the category and specific nature of the fault that triggered the termination (for example, 'Cease' with a subcode indicating administrative shutdown, or 'Update Message Error' with a subcode indicating a malformed attribute), giving the receiving peer's administrator concrete diagnostic information about exactly why the session was torn down.
Updating route attributes while keeping a session alive is the role of the UPDATE message, not NOTIFICATION, and refreshing a neighbor's table without resetting the session describes the optional Route Refresh capability (a separate, distinct BGP mechanism), neither of which describes NOTIFICATION's function.
NEW QUESTION # 145
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