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| Section | Objectives |
|---|---|
| Topic 1: BGP | - BGP basic operations and message types - EBGP and IBGP peer interactions - Attributes and path selection |
| Topic 2: High Availability | - VRRP, NSR, NSB and BFD - Link Aggregation Groups and RTG - Virtual chassis and graceful restart |
| Topic 3: Protocol-Independent Routing | - Load balancing and filter-based forwarding - Martian addresses and RIB groups - Static, aggregate, generated routes |
| Topic 4: Layer 2 Security | - BPDU, loop and root protection - Layer 2 firewall filters - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - MACsec and storm control |
| Topic 5: Layer 2 Switching and VLANs | - Inter-VLAN routing - Native VLANs and voice VLANs - Ports and VLAN tagging - Bridging components - Frame processing |
| Topic 6: IS-IS | - Link-state database and PDUs - Levels, areas and metrics - Adjacencies and troubleshooting |
| Topic 7: Spanning Tree | - Convergence and reconvergence - STP and RSTP concepts, roles and states - Bridge Protocol Data Units (BPDUs) |
| Topic 8: Tunnels | - IP tunneling concepts - GRE and IP-IP configuration and troubleshooting |
| Topic 9: OSPF | - Router ID, adjacencies and neighbors - Areas and LSA types - Link-state database and packet types |
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NEW QUESTION # 44
Both the R1 and R2 devices are advertising prefix X into AS 65530 with the BGP attributes shown in the exhibit.
Which statement is correct in this scenario?
Answer: D
NEW QUESTION # 45
Which statement describes how a generated route determines its next hop?
Answer: C
Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least-specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here.
NEW QUESTION # 46
You need to configure a LAG between your switches. In this scenario, which two statements are correct? (Choose two.)
Answer: A,C
Explanation:
Up to 64 Ethernet interfaces can be grouped to form a LAG, and In a Junos Fusion, up to 1,000 LAGs are supported on QFX10002 switches acting as aggregation devices.
The LAG must be configured on both sides of the link.
The interfaces on either side of the link must be set to the same speed and be in full-duplex mode.
NEW QUESTION # 47
On Juniper devices, which statement correctly describes a basic characteristic of a GRE tunnel?
Answer: A
Explanation:
GRE is fundamentally a stateless encapsulation protocol: the encapsulating router simply wraps the passenger packet in a GRE header and an outer delivery IP header and forwards it based on ordinary IP routing table lookups toward the configured tunnel destination address. For that forwarding to succeed, the underlying (global or routing-instance) routing table on each endpoint must contain a valid, reachable route to the far-end tunnel address; without such a route, the tunnel interface will not come up or will be unable to deliver traffic, since GRE relies entirely on the existing IP infrastructure rather than any tunnel-specific signaling to establish reachability.
Because GRE has no built-in state machine or session negotiation, it does not natively track whether the remote endpoint is alive -- that requires an optional add-on such as GRE keepalives or BFD, neither of which is enabled by default; an operator must explicitly configure them if failure detection is required. GRE is also protocol-agnostic rather than IPv4-only: it can encapsulate IPv4, IPv6, MPLS, and other network- layer protocols as the passenger, which is one of its defining advantages over IP-in-IP tunneling. Finally, because GRE keeps no per-session state about the peer, it cannot detect or report tunnel failures on its own, reinforcing why route reachability is the one true prerequisite for tunnel operation.
NEW QUESTION # 48
Which statement describes how a generated route determines its next hop?
Answer: C
Explanation:
A generate route is a specialized type of Junos summary route that, unlike an aggregate route, is permitted to inherit and use an actual forwarding next hop rather than being restricted to reject or discard. When multiple contributing routes exist beneath the summarized prefix, Junos selects one of them as the primary contributor using a deterministic process: it first evaluates route preference (choosing the contributor with the lowest, most preferred value), then breaks any remaining tie by preferring the contributing route with the numerically lowest metric, and continues through further tie-breaking criteria if necessary until a single primary contributor is identified. The generate route then adopts the next hop of that specific primary contributor as its own forwarding next hop, meaning traffic matching the generate route but not matching any individual contributing route is forwarded toward whichever real next hop the primary (best) contributing route currently uses. This behavior is fundamentally different from an aggregate route, which never adopts a forwarding next hop at all and instead installs with a reject (or optionally discard) next hop by default, deliberately preventing traffic from being forwarded toward a next hop that might not actually lead to the intended more-specific destination. There is no mechanism by which the next hop is chosen arbitrarily from the 'first' or 'least- specific' contributor, and while a next hop can be manually overridden under the generate route's own configuration, that is not the default resolution behavior being described here. Reference topics: Junos Enterprise Routing - Protocol Independent Routing, Generate Routes and Primary Contributor Selection.
NEW QUESTION # 49
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