R1 has an OSPF adjacency with R2 over a point-to-point link.
Which three statements about the advertisements for this link in the Type 1 (Router) LSA
generated by R1 are true? (Choose three.)
A.
It has a value in the link ID field with R2’s interface IP address.
B.
It has a value in the link ID field with R2’s router ID.
C.
It has a link-type of point-to-point (Type 1).
D.
It has a link-type of Transit (Type 2).
E.
It has a link-type of stub (Type 3).
The correct answer would be: B,C and E
The link-type of transit is used on broadcast domains.
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B,C,E should be the answer, and below is a supporting note.
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Router LSA
Each OSPF-speaking router generates a Type 1 LSA to describe the status and cost (metric) of all interfaces on the router. This LSA is flooded to each router in the OSPF area. It is defined as having an area scope; therefore, it is not flooded across an area boundary. In addition to the standard LSA header, the router LSA also contains the following fields:
• V, E, and B bits (1 byte): Following five bits set to a value of 0, the V, E, and B bits represent the characteristics of the originating router. The V bit is set when a virtual link is established. An ASBR sets the E bit. An ABR sets the B bit.
• Reserved (1 byte): Reserved field. Value is always 0.
• Number of links (2 bytes): Gives the total number of links represented by the remaining six fields.
• Link ID (4 bytes): Represents the type of link the far end of the link is connected to.
• Link data (4 bytes): Represents what the near side of the link is connected to.
• Link type (1 byte): Describes the type of link. Used with Link ID and Link data fields.
• Number of type of service (ToS) metrics (1 byte): Lists the number of type of service metrics encoded. Only a value of 0 is supported.
• Metric (2 bytes): Contains the cost to transmit data out of the interface.
• Additional ToS data (4 bytes): This field is unused.
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Link ID and Link Data Fields
The information in the router LSA’s link ID and link data fields is associated with the type of link OSPF is operating. The following link types are supported:
• Point-to-point (Type 1): On a point-to-point interface, an OSPF router always forms an adjacency with its peer over an unnumbered connection. As such, the link ID field contains the neighbor’s router ID. The link data field contains the IP address of the interface on the local router.
• Transit (Type 2): A connection to a broadcast segment is always noted as a transit link. The link ID field contains the interface IP address of the segment’s DR. The link data field contains the interface IP address of the local router.
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Hope this saves you time in searching for details.
• Stub (Type 3): A router advertises a stub network when a subnet does not connect to any OSPF neighbors. Advertising a stub network occurs for the loopback interface and any passive interfaces. In addition, the IP subnet for any point-to-point interface is advertised as a stub because the adjacency was formed over an unnumbered interface. The link ID field for a stub network contains the IP network number and the link data field contains the subnet mask.
• Virtual link (Type 4): A virtual link operates between an ABR connected to Area 0 and an ABR that is not connected to Area 0. Once established, the virtual link appears in the Area 0 router LSA of each endpoint. The link ID field contains the neighbor’s router ID, and the link data field contains the interface IP address of the local router.
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New JNCIP-ENT JN0-647 Exam Questions and Answers Updated Recently (15/Nov/2017):
NEW QUESTION 61
Which three databases are used by the Dijkstra algorithm? (Choose three.)
A. Tree database
B. Link State database
C. Candidate database
D. MAC database
E. Configuration database
Answer: ABC
NEW QUESTION 62
Which two statements are true about PIM source-specific multicast (SSM)? (Choose two.)
A. The receiver DR builds a source-base tree to the RP.
B. S,G is always used.
C. A Different group address must be used by each source.
D. IGMPv3 is required.
Answer: BD
NEW QUESTION 63
You are asked to merge a RIP network with your OSPF network. As a first step, you establish connectivity between the RIP network and the OSPF network. The RIP network connects to an NSSA area. Which two statements are true in this scenario? (Choose two.)
A. To share RIP routes with the OSPF network, an export policy will be required on the ABR.
B. To share RIP routes with the OSPF network, an export policy will be required on the ASBR.
C. By default, external OSPF routes have a higher route preference than RIP routes.
D. Be default, RIP routes have a higher route preference than external OSPF routes.
Answer: BD
NEW QUESTION 64
Your campus EX9200 core devices are highly oversubscribed on bandwidth and reporting massive dropped packets. To immediately address the issue, you decide to implement shaping on all interfaces. Which action will accomplish?
A. Apply the input-shape-rate 5G parameter to all interfaces under the [edit class-of service] hierarchy.
B. Define a CoS input traffic control profile with the shape-rate 5G parameter and apply it to all interfaces.
C. Define a CoS output traffic control profile with the shape-rate 5G parameter and apply it to all interfaces.
D. Apply the shape-rate 5G parameter to all interfaces under the [edit class-of service] hierarchy.
Answer: C
NEW QUESTION 65
What allows non-Web enabled devices to access the network on a port configured for captive portal?
A. A MAC address white list can be configured on the switch to allow specific MAC addresses to bypass the captive portal process.
B. LLDP can be used to query the type of device that is attempting to access the network, and predefined device types can be allowed to bypass the captive portal process.
C. Captive portal can be configured to only prompt for credentials when HTTP or HTTPS traffic is requested on a port to allow on-HTTP enabled devices access to the network.
D. Authentication credentials for specific devices can be preconfigured on the switch for automatic authentication.
Answer: A
NEW QUESTION 66
……
NEW QUESTION 67
Which two statements about MVRP are correct? (Choose two.)
A. MVRP monitors interfaces using VSTP and dynamically creates VLANs as necessary.
B. MVRP PDUs are sent to other switches as periodic intervals.
C. MVRP can propagate dynamic VLANs created on one switch to another switch.
D. MVRP is enabled by adding trunk ports under the [edit protocols mvrp] hierarchy.
Answer: BD
NEW QUESTION 68
……
NEW QUESTION 69
A customer needs to pass Layer 2 protocols between sites. Which protocol or standard would be required to implement connectivity on EX4300, EX3400, and EX2300 devices?
A. Q-in-Q
B. IGMP
C. VPLS
D. OSPF
Answer: A
NEW QUESTION 70
Which statement is correct about MSTP?
A. MSTP enables mapping multiple independent spanning-tree instances onto one physical topology.
B. MSTP enables dynamic discovery of Layer 2 neighbors.
C. MSTP dynamically manages VLAN registration in a LAN.
D. MSTP uses stacked VLAN tags to extend a Layer 2 Ethernet connection between multiple sites.
Answer: A
NEW QUESTION 71
You configured static mode power management on an EX4300 to provide PoE power to telephone and access point equipment. Which statement is correct regarding the PoE power budget?
A. Power is budgeted to devices on a first come, first served basis as devices are connected.
B. The power budgeted will be based on the device class connected to each port.
C. Power is budgeted to a port even if no device is connected to the port.
D. The power budgeted to ports will adjust to how much power a device actually uses.
Answer: C
NEW QUESTION 72
What information must you gather from the satellite device to provision a Junos Fusion Enterprise deployment on the aggregation device? (Choose two.)
A. MAS address
B. Serial number
C. Software version
D. Model number
Answer: AB
NEW QUESTION 73
You created a firewall rule to protect the Routing Engine. After applying the rule, your OSPF adjacencies dropped. How would you solve this problem?
A. Create a firewall term that allows IP protocol 89.
B. Define a router ID under the [edit routing-options] hierarchy.
C. Configure the loopback interface under the [edit protocols ospf] hierarchy.
D. Apply the firewall filter to the physical ports.
Answer: A
NEW QUESTION 74
What are two OSPF LSA types? (Choose two.)
A. Stub
B. Router
C. Transit
D. Network
Answer: BD
NEW QUESTION 75
……
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