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| Section | Objectives |
|---|---|
| Topic 1: Layer 2 Switching Technologies | - VLANs and trunking - Ethernet switching concepts - Spanning Tree Protocol (STP/RSTP/MSTP) |
| Topic 2: Routing Protocols | - BGP fundamentals and policy control - IS-IS overview - OSPF configuration and troubleshooting |
| Topic 3: High Availability | - Redundancy concepts in enterprise networks - VRRP configuration and behavior |
| Topic 4: Operations and Troubleshooting | - Junos CLI monitoring tools - Troubleshooting routing and switching issues |
| Topic 5: Routing Policy and Filtering | - Route filtering and preference control - Policy statements |
| Topic 6: Network Services | - Basic multicast concepts - NAT concepts in Junos |
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NEW QUESTION # 121
Refer to Exhibit. Which two statements about the output shown in the exhibit are correct?
(Choose two.)
Answer: A,C
Explanation:
The L column in this output identifies which IS-IS levels are active on each interface, using the standard bitmask where 1 represents Level 1 only and 3 represents both Level 1 and Level 2 combined. Interface ge-0/0/2.0 shows an L value of 1 and its Level 2 DR field explicitly reads Disabled, meaning Level 2 has not been enabled on that circuit at all; consequently no Level 2 adjacency can ever form there, regardless of what the neighboring router advertises, which confirms that statement as correct. The lo0.0 loopback interface shows Passive under both the Level 1 DR and Level 2 DR columns. A passive IS-IS interface is deliberately excluded from adjacency formation -- no IIH PDUs are sent or expected on it -- but its associated prefix is still injected into the router's own LSP and flooded throughout the area, which is precisely why loopbacks are configured as passive: to guarantee the router ID/loopback prefix is reachable network-wide without wasting adjacency overhead on an interface with no real neighbor. This confirms that R3 advertises its loopback address, while ruling out the claim that the loopback is used to form an adjacency. Regarding designated routers, all circuits shown here report 'Point to Point' rather than an actual DR system ID, because DR election in IS-IS is a construct exclusive to broadcast (LAN) circuits; point-to-point circuits never elect a DR, so the first statement is false.
NEW QUESTION # 122
Which statement describes the purpose of an integrated routing and bridging (IRB) interface on a Juniper Networks EX Series Switch?
Answer: A
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 # 123
You have enabled MACsec on two directly connected Ethernet devices but MACsec is not working.
Which two actions will solve this problem? (Choose two.)
Answer: C,D
Explanation:
MACsec (IEEE 802.1AE) secures a point-to-point Ethernet link independently of how the logical unit above it is configured for VLAN tagging, so neither trunk mode nor access mode has any bearing on whether the MACsec Key Agreement (MKA) protocol can establish a secure channel. What does determine success is the pre-shared key material: when static CAK security mode is used, the Connectivity Association Key (CAK) and the Connectivity Association Key Name (CKN) must be configured identically on both ends of the link.
If they do not match, MKA never completes the exchange, no secure channel is created, and all traffic on that interface is dropped rather than merely left unencrypted. Equally important, and frequently overlooked, is that MACsec adds up to 32 bytes of overhead per frame for the security tag (SecTAG) and integrity check value (ICV); Juniper's official guidance is to ensure the difference between the interface's physical MTU and the protocol MTU is large enough to absorb this overhead, or frames will be silently discarded once encryption is active, producing symptoms that look identical to a failed session. Both the CAK/CKN and MTU checks are documented first-line troubleshooting steps for MACsec on EX Series switches. Reference topics: Junos Enterprise Switching - Layer 2 Security, Configuring and Troubleshooting MACsec on EX Series Switches.
NEW QUESTION # 124
You have configured a GRE interface, but no traffic will flow.
Referring to the exhibit, which statement is true?
Answer: C
NEW QUESTION # 125
You are required to ensure that Switch 1 will always be designated as the root bridge when participating in your switched network. What do you need to do to satisfy this requirement?
Answer: D
Explanation:
Because root bridge election is decided primarily by comparing bridge priority values -- with the switch advertising the numerically lowest priority always winning, and MAC address serving only as a fallback tiebreaker when priorities are tied -- the only deterministic, reliable way to guarantee that a specific switch is elected root regardless of any other switch's hardware characteristics is to explicitly configure that switch with a lower bridge priority than every other participating switch in the topology. Relying on MAC address alone, as the first distractor suggests, is fundamentally unreliable: MAC addresses are burned in at the factory, cannot be predicted or controlled by the administrator, and any future hardware replacement or newly introduced switch with a numerically lower MAC address could unexpectedly seize the root role since MAC comparison only comes into play at equal priority in the first place, meaning a 'highest MAC' strategy does not even align with how the tiebreak actually favors the lowest value. Port priority and port cost are entirely separate STP parameters that influence which port on a non-root switch is selected as its root port, or which port is selected as designated versus blocking on a given segment; neither parameter has any bearing whatsoever on which switch is elected root bridge for the whole topology, since that decision is made purely from the Bridge ID comparison, independent of any per-port settings. Explicitly and deliberately lowering Switch 1's configured bridge priority is the only correct, industry-standard method.
NEW QUESTION # 126
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