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| Section | Objectives |
|---|---|
| Tunnels | - GRE and IP-IP configuration and troubleshooting - IP tunneling concepts |
| Spanning Tree | - Convergence and reconvergence - Bridge Protocol Data Units (BPDUs) - STP and RSTP concepts, roles and states |
| BGP | - EBGP and IBGP peer interactions - Attributes and path selection - BGP basic operations and message types |
| IS-IS | - Levels, areas and metrics - Adjacencies and troubleshooting - Link-state database and PDUs |
| High Availability | - Virtual chassis and graceful restart - Link Aggregation Groups and RTG - VRRP, NSR, NSB and BFD |
| OSPF | - Link-state database and packet types - Areas and LSA types - Router ID, adjacencies and neighbors |
| Layer 2 Switching and VLANs | - Native VLANs and voice VLANs - Bridging components - Frame processing - Ports and VLAN tagging - Inter-VLAN routing |
| Protocol-Independent Routing | - Static, aggregate, generated routes - Martian addresses and RIB groups - Load balancing and filter-based forwarding |
| Layer 2 Security | - MACsec and storm control - BPDU, loop and root protection - Port security (MAC limiting, DHCP snooping, DAI, IP source guard) - Layer 2 firewall filters |
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102. Frage
Referring to the exhibit, which router will become the OSPF BDR if all routers are powered on at the same time?
Antwort: B
Begründung:
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.
103. Frage
Depending on the link type, OSPF sends link-state update packets to which two addresses? (Choose two.)
Antwort: B,C
Begründung:
OSPF relies on two IANA-reserved multicast addresses to distribute its control-plane traffic across broadcast and NBMA network types, and Link State Update (LSU) packets, which carry the actual LSAs being flooded, are addressed to one or the other depending on the role of the sending router. The address 224.0.0.5, designated AllSPFRouters, is used when any OSPF router - including a router that is itself the Designated Router or Backup Designated Router - needs to flood an LSU to every OSPF-speaking router on the segment; this is the address used for Hello packets universally and for LSU flooding directed at the entire segment. The address 224.0.0.6, designated AllDRouters, is used specifically by non-DR, non-BDR routers (DROthers) when they need to send an LSU or other update destined for the DR and BDR only, since only the DR and BDR actually listen on this address; the DR then takes responsibility for reflooding that information to the rest of the segment using 224.0.0.5. This two-address design is central to how OSPF achieves flooding efficiency on multi-access networks by funneling updates through the DR rather than requiring full-mesh flooding among every router pair. The addresses 224.0.0.8 and 224.0.0.9 are not used by OSPF at all;
224.0.0.9 is in fact reserved for RIPv2 multicast updates, making it a plausible-looking but incorrect distractor. Reference topics: Junos Enterprise Routing - OSPF, Multicast Addressing for Hello and Link State Update Packets.
104. Frage
Which two statements are true about high availability on Junos devices? (Choose two.)
Antwort: A,B
105. Frage
What is the purpose of the native VLAN feature on the Juniper Networks EX Series Switches?
Antwort: C
Begründung:
A native VLAN is a trunk-port concept, not an access-port concept. On an 802.1Q trunk, every frame is normally expected to carry a VLAN tag identifying its membership; the native VLAN is the single exception that Junos permits an administrator to define using the native-vlan-id statement under the trunk interface's family ethernet-switching hierarchy. Any untagged frame arriving on that trunk port is automatically classified into the configured native VLAN, and conversely, outbound frames belonging to the native VLAN are transmitted untagged rather than with an 802.1Q header. This behavior exists chiefly for interoperability with legacy or third-party devices that either cannot generate 802.1Q tags or intentionally send management or default traffic untagged across an otherwise tagged trunk. Access ports, by definition, only ever carry a single VLAN's traffic and never receive tagged frames in normal operation, so the native VLAN mechanism has no relevance there - which eliminates the access-port-oriented answer choices. The native VLAN also does not restrict a trunk to a single VLAN; the trunk continues to carry all configured tagged VLANs simultaneously, with the native VLAN simply being the designated untagged exception. Misconfiguring or mismatching native VLAN IDs between two trunk peers is a classic Layer 2 troubleshooting scenario on the exam. Reference topics: Junos Enterprise Switching - VLANs, Configuring the Native VLAN on a Trunk Interface.
106. Frage
You are asked to create a new firewall filter to evaluate Layer 3 traffic that is being sent between VLANs. In this scenario, which two statements are correct? (Choose two.)
Antwort: B,C
Begründung:
A firewall filter is a configuration that defines the rules that determine whether to forward or discard packets at specific processing points in the packet flow. A firewall filter can also modify the attributes of the packets, such as priority, marking, or logging. A firewall filter can be applied to various interfaces, protocols, or routing instances on a Juniper device. A firewall filter has a family attribute, which specifies the type of traffic that the filter can evaluate. The family attribute can be one of the following: inet, inet6, mpls, vpls, iso, or ethernet- switching. The family inet firewall filter is used to evaluate IPv4 traffic, which is the most common type of Layer 3 traffic on a network.
To create a family inet firewall filter, you need to specify the appropriate match criteria and actions for each term in the filter. The match criteria can include various fields in the IPv4 header, such as source address, destination address, protocol, port number, or DSCP value. The actions can include accept, discard, reject, count, log, policer, or next term. To apply a firewall filter to Layer 3 traffic that is being sent between VLANs, you need to apply the filter to the appropriate IRB interface. An IRB interface is an integrated routing and bridging interface that provides Layer
3 functionality for a VLAN on a Juniper device. An IRB interface has an IP address that acts as the default gateway for the hosts in the VLAN. An IRB interface can also participate in routing protocols and forward packets to other VLANs or networks.
Therefore, option C is correct, because you should create a family inet firewall filter with the appropriate match criteria and actions. Option D is correct, because you should apply the firewall filter to the appropriate IRB interface
107. Frage
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