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NEW QUESTION # 44
In the exhibit, each IP subnet in the campus environment is associated with a unique VLAN ID.
Which action will ensure that Host C will communicate with Host A and Host B?
- A. Configure a port-based ACL that permits inter-VLAN routing for all configured VLANs
- B. Configure all switch ports connecting to the host devices as trunk ports associated with all VLANs
- C. Configure all switch ports connecting to the host devices as access ports associated with a common VLAN
- D. Configure an IRB interface for each VLAN and associate it with its corresponding VLAN
Answer: D
NEW QUESTION # 45
Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)
- A. AS path
- B. MED
- C. community
- D. next hop
Answer: A,D
Explanation:
Explanation
BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention1. There are four categories of BGP attributes123:
Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers123.
Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates1.
Optional transitive: May not be supported by all implementations of BGP1.
Optional non-transitive: May not be supported by all implementations of BGP1.
The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update123. These include the AS path and next hop attributes23. Therefore, options A and C are correct.
NEW QUESTION # 46
Which statement is correct about the exhibit?
- A. All the routes from first.inet.0 and second.inet.0 will be imported into inet.0.
- B. Only the interface routes from first.inet.0 and second.inet.0 will be imported into inet.0.
- C. Only the interface routes from inet.0 will be imported into both first.inet.0 and second.inet.0.
- D. All routes from inet.0 will be imported into first.inet.0 and second.inet.0.
Answer: C
NEW QUESTION # 47
Which command displays the output shown in the exhibit?
- A. show route forwarding-table
- B. show ethernet-switching table extensive
- C. show route forwarding-table family ethernet-switching
- D. show ethernet-switching table
Answer: D
Explanation:
This command shows the Ethernet switching table, which includes information about MAC addresses, their associated VLANs, and the interfaces they are learned on, similar to the output shown in your exhibit.
NEW QUESTION # 48
You have two OSPF routers forming an adjacency. R1 has a priority of 32 and a router ID of 192.168.1.2. R2 has a priority of 64 and a router ID of 192.168.1.1. The routers were started at the same time and all other OSPF settings are the default settings.
Which statement is correct in this scenario?
- A. R1 will be the BDR.
- B. R2 will be the BDR.
- C. At least three routers are required for a DR/BDR election
- D. Router IDs must match for an adjacency to form.
Answer: A
Explanation:
Explanation
In OSPF, the Designated Router (DR) and Backup Designated Router (BDR) are elected based on the priority of the routers1. The router with the highest priority becomes the DR, and the router with the second highest priority becomes the BDR1. If there is a tie in priority, then the router with the highest Router ID is chosen1.
In this scenario, R2 has a higher priority (64) than R1 (32), so R2 will become the DR1. Since R1 has the second highest priority, it will become the BDR1. Therefore, option D is correct.
NEW QUESTION # 49
Referring to the exhibit, what will be the IS-IS adjacency result of the configurations?
- A. A level 2 IS-IS adjacency will form.
- B. No IS-IS adjacencies will form.
- C. A level 1 IS-IS adjacency will form.
- D. A level 1 and level 2 IS-IS adjacency will form.
Answer: B
NEW QUESTION # 50
A new network requires multiple topology support. You decide to use IS-IS in this situation. Which three protocol topologies are supported in this scenario? (Choose three.)
- A. anycast
- B. IPv4
- C. IPv6
- D. IPsec
- E. multicast
Answer: B,C,E
Explanation:
IS-IS (Intermediate System to Intermediate System) is a routing protocol that is designed to move information efficiently within a computer network. It supports multiple protocol topologies, including IPv4, IPv6, and multicast.
NEW QUESTION # 51
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.)
- A. MTU is not at least 1492 bytes.
- B. The Level 2 routers have mismatched areas.
- C. The lo0 interface is not included as an IS-IS interface.
- D. IP subnets are not a /30 address.
Answer: A,C
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 # 52
Referring to the exhibit, which two configuration changes must you apply for packets to reach from R1 to R3 using IS-IS? (Choose two.)
- A. On R3 disable Level 2 on the ge-0/0/4 interface.
- B. On R1, disable Level 2 on the ge-0/0/1 interface.
- C. On R3 enable Level 1 on the ge-0/0/4 interface
- D. On R1, enable Level 1 on the ge-0/0/1 interface.
Answer: C,D
Explanation:
A) On R1, enable Level 1 on the ge-0/0/1 interface. In IS-IS, both levels (Level 1 and Level 2) are enabled by default when you enable IS-IS on an interface1. Level 1 systems route within an area.
If the destination is outside an area, Level 1 systems route toward a Level 2 system. Therefore, enabling Level 1 on the ge-0/0/1 interface on R1 would allow packets to reach from R1 to R3.
D) On R3 enable Level 1 on the ge-0/0/4 interface Similarly, enabling Level 1 on the ge-0/0/4 interface on R3 would allow packets to reach from R1 to R3. These explanations are based on the IS-IS configuration documents and learning resources available at Juniper Networks1 and Cisco.
NEW QUESTION # 53
Which statement is correct about controlling the routes installed by a RIB group?
- A. A firewall filter must be configured to install routes in the RIB groups.
- B. An export policy is applied to the RIB group.
- C. Only routes in the last table are installed.
- D. An import policy is applied to the RIB group.
Answer: D
Explanation:
Explanation
A RIB group is a configuration that allows a routing protocol to install routes into multiple routing tables in Junos OS. A RIB group consists of an import-rib statement,which specifies the source routing table, and an export-rib statement, which specifies the destination routing table or group. A RIB group can also include an import-policy statement, which specifies one or more policies to control which routes are imported into the destination routing table or group1.
An import policy is a policy statement that defines the criteria for accepting or rejecting routes from the source routing table. An import policy can also modify the attributes of the imported routes, such as preference, metric, or community. An import policy can be applied to a RIB group by using the import-policy statement under the [edit routing-options rib-groups] hierarchy level1.
Therefore, option A is correct, because an import policy is applied to the RIB group to control which routes are installed in the destination routing table or group. Option B is incorrect, because all routes in the source routing table are imported into the destination routing table or group, unless filtered by an import policy.
Option C is incorrect, because a firewall filter is not used to install routes in the RIB groups; a firewall filter is used to filter packets based on various criteria. Option D is incorrect, because an export policy is not applied to the RIB group; an export policy is applied to a routing protocol to control which routes are advertised to other devices.
References:
1: rib-groups | Junos OS | Juniper Networks
NEW QUESTION # 54
You are an operator for a network running IS-IS. Two routers are failing to form an adjacency.
What are two reasons for this problem? (Choose two.)
- A. There is a mismatched area ID between the L2 routers.
- B. The family iso configuration is missing from the adjacency interface.
- C. There are mismatched router IDs on the L2 routers.
- D. There is no configured ISO address on any IS-IS interface.
Answer: B,D
Explanation:
The two reasons for the failure to form an adjacency in a network running IS-IS could be:
B) There is no configured ISO address on any IS-IS interface. IS-IS requires each router interface to have an ISO address configured. Without this address, the routers cannot form an adjacency.
D) The family iso configuration is missing from the adjacency interface. The 'family iso' configuration is essential for IS-IS to function correctly. If this configuration is missing from the adjacency interface, it could prevent the formation of an adjacency.
These explanations are based on the Enterprise Routing and Switching Specialist (JNCIS-ENT) documents and learning resources available at Juniper Networks.
NEW QUESTION # 55
Which two mechanisms are part of building and maintaining a Layer 2 bridge table? (Choose two.)
- A. listening
- B. learning
- C. flooding
- D. blocking
Answer: B,C
Explanation:
Option B is correct. Flooding is a mechanism used in Layer 2 bridging where the switch sends incoming packets to all its ports except for the port where the packet originated1. This is done when the switch doesn't know the destination MAC address or when the packet is a broadcast or multicast1.
Option C is correct. Learning is another mechanism used in Layer 2 bridging where the switch learns the source MAC addresses of incoming packets and associates them with the port on which they were received23. This information is stored in a MAC address table, also known as a bridge table23.
Option A is incorrect. Blocking is a state in Spanning Tree Protocol (STP) used to prevent loops in a network2. It's not a mechanism used in building and maintaining a Layer 2 bridge table2.
Option D is incorrect. Listening is also a state in Spanning Tree Protocol (STP) where the switch listens for BPDUs to make sure no loops occur in the network before transitioning to the learning state2. It's not a mechanism used in building and maintaining a Layer 2 bridge table2.
NEW QUESTION # 56
Which two statements about DHCP snooping are correct? (Choose two.)
- A. DHCP snooping uses ARP to add statically defined IP addresses to its database.
- B. The DHCP database maps IP addresses, MAC addresses, and the associated VLAN.
- C. DHCP snooping inspects all DHCP packets on untrusted ports.
- D. By default, the Junos OS treats access ports as trusted and trunk ports as untrusted.
Answer: B,C
NEW QUESTION # 57
Which statement is correct about the IS-IS ISO NET address?
- A. You can only define a single ISO NET address per device.
- B. An ISO NET address defined with a system ID of 0000.0000.0000 must be selected as the DIS.
- C. An ISO NET address must be unique for each device in the network.
- D. The Area ID must match on all devices within a L2 area.
Answer: C
Explanation:
An ISO NET address is a type of network address used by the IS-IS routing protocol. It identifies a point of connection to the network, such as a router interface, and is also called a Network Service Access Point (NSAP)1.
An ISO NET address consists of three parts: an area ID, a system ID, and a selector2. The area ID identifies the IS-IS area to which the device belongs. The system ID uniquely identifies the device within the area. The selector identifies a specific service or function on the device, such as routing or management2.
An ISO NET address must be unique for each device in the network, because it is used by IS-IS to establish adjacencies, exchange routing information, and compute shortest paths2. If two devices have the same ISO NET address, they will not be able to communicate with each other or with other devices in the network. Therefore, it is important to assign different ISO NET addresses to each device in the network.
NEW QUESTION # 58
Exhibit
Which command displays the output shown in the exhibit?
- A. show route forwarding-table
- B. show ethernet-switching table extensive
- C. show route forwarding-table family ethernet-switching
- D. show ethernet-switching table
Answer: D
Explanation:
The output shown in the exhibit is a brief display of the Ethernet switching table, which shows the learned Layer 2 MAC addresses for each VLAN and interface1.
The command show ethernet-switching table displays the Ethernet switching table with brief information, such as the destination MAC address, the VLAN name, the forwarding state, and the interface name1.
The command show route forwarding-table displays the routing table information for each protocol family, such as inet, inet6, mpls, iso, and so on2. It does not show the Ethernet switching table or the MAC addresses.
The command show ethernet-switching table extensive displays the Ethernet switching table with extensive information, such as the destination MAC address, the VLAN name, the forwarding state, the interface name, the VLAN index, and the tag type1. It shows more details than the brief output shown in the exhibit.
The command show route forwarding-table family ethernet-switching displays the routing table information for the ethernet-switching protocol family, whichshows the destination MAC address, the next-hop MAC address, and the interface name3. It does not show the VLAN name or the forwarding state.
NEW QUESTION # 59
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