Router A is an OSPF router connected to both Area 0 and Area 1 Area 1 has been configured as a stub area. Which two LSA types does Router A suppress from Area 1 ?
A.
Router LSA
B.
External LSA
C.
Summary LSA
D.
ASBR Summary LSA
Which two LSA types does Router A suppress from Area 1 ?
Router A is an OSPF router connected to both Area 0 and Area 1 Area 1 has been configured as a stub area. Which two LSA types does Router A suppress from Area 1 ?
question expect two answers. when i click answer tab i can see only one answer (a), second ansswer should be (D)
the right answers are B and D, NOT A
Open Shortest Path First – OSPF Operation
Neighbor Discovery
Forming Adjacencies
Link State Advertisements (LSAs)
Types (by type code)
1 – Router LSA
2 – Network LSA
3 – Network summary LSA
4 – ASBR Summary LSA
5 – AS External LSA
6 – Group Membership LSA
7 – NSSA External LSA
8 – External Attributes LSA
9 – Opaque LSA (link-local scope)
10 – Opaque LSA (area-local scope)
11 – Opaque LSA (AS scope)
Flooding
Reliable Transport
Shortest Path First Calculations
Ref: http://www.inetdaemon.com/tutorials/internet/ip/routing/ospf/
So, correct answers are A.Router LSA & D.ASBR Summary LSA
mr_tienvu- If you say D, as a matter of logic, then you must say B. ASBR summary Type 4 are only generated by the ABR as a result of AS External Type 4. Making area 1 a stub area, suppresses Type 5 as a result Type 4 are not generated.Router LSA will still be generated by the ABR into Area 1 and Area 0 since it has a link in both areas.
So the correct answer is B and D
Just a matter of curiosity, how did you get answer A from the information you posted?
BTW, the question is not worded properly. It the word suppress should qualified by “suppress from going into Area 1” Because conversely it could be suppress from leaving Area 1.
By default Router and Network LSA are exchanged only inside a area (intra-area. Summary LSA is generated by the ABR to announce the networks for the area where resides to the other area where is connected.
Stub areas are areas through which, or into which, AS external advertisements are not flooded (LSA type 4 and type 5). Stub areas do, however, include LSA type 1, type 2, and type 3.
In my opinion the right answers should be B and D because this are the LSA types that are suppressed to be announced to the other area when Stub is configured.
I agree with you. ASBR Summary LSA generated by own ASR according to AS External LSA and can’t be suppressed
No AS Extern – no ASBR Summary, I wanted to say.
I agree. OSPF Type 1-2-3
To me, 2 correct answers are not given in the answers. Because, if you see the question carefully, its asking which LSA types are suppressed from Area1 not the LSA will be suppressed toward Area 1. In fact, the true answer would be Router LSA and Network LSA will be suppressed from Area1. And to Area1 , Type 4 and 5 will be suppressed. As the answer doesn’t state about Rotuer LSA and Network LSA so we have to choose the answers B and D.
Please share if anyone has any other thoughts.
I agree with what you say. LSA type 1 and 2 would be the correct answer. Also take into consideration that A router in a stub area can’t advertise external and LSA Type 4, that’s one the the stub limitation, it would have to be a NSSA. So the question should be “Which two LSA types does Router A suppress towards Area 1”
To control the advertisement of external routes into an area, OSPF uses stub areas. By designating an area border router (ABR) interface to the area as a stub interface, you suppress external route advertisements through the ABR. Instead, the ABR automatically advertises a default route (through itself) in place of the external routes. Packets destined for external routes are automatically sent to the ABR, which acts as a gateway for outbound traffic and routes them appropriately
So correct options:
B.
D.
The question is stating that Router A participate in both Area 1 and area0 which means that Router A is an ABR , ABR generate 2 type of LSAs , type 3 which is external summary of other areas and type 4 which is details of networks from other ASBRs , so it will suppress these 2 LSAs and will only generate a default route and Summary address without details
so B&D are the correct answers
>New JN0-360 Exam Questions and Answers Updated Recently (14/Mar/2017):<
NEW QUESTION 341
Which OSPF LSA type describes the router IDs of ASBR routers located in remote areas?
A. Type 4
B. Type 2
C. Type 3
D. Type 1
Answer: A
Explanation:
OSPF LSA types:
LSA Type 1: Router LSA
LSA Type 2: Network LSA
LSA Type 3: Summary LSA
LSA Type 4: Summary ASBR LSA
LSA Type 5: Autonomous system external LSA
LSA Type 6: Multicast OSPF LSA
LSA Type 7: Not-so-stubby area LSA
LSA Type 8: External attribute LSA for BGP
NEW QUESTION 342
Referring to the exhibit, which two statements are correct? (Choose two.)
[edit]
user@host# show protocols ospf
area 0.0.0.0
{
interface ge-3/0/0.0
{
interface-type p2p;
}
}
A. Type 2 LSAs are not created for this link.
B. Type 2 LSAs are created for this link.
C. Designated router election does not occur on this link.
D. Designated router election occurs on this link.
Answer: AC
Explanation:
A: Type 2 – Network LSA – the designated router (DR) on a broadcast segment (e.g. Ethernet) lists which routers are joined together by the segment. Type 2 LSAs are flooded across their own area only. The link- state ID of the type 2 LSA is the IP interface address of the DR.
C: Designated router (DR) and BDR election is done via the Hello protocol. Hello packets are exchanged via IP multicast packets (Appendix B) on each segment. Multicast packets are not sent on p2p links.
NEW QUESTION 343
What are three well-known mandatory BGP attributes? (Choose three.)
A. origin
B. MED
C. AS path
D. next hop
E. local preference
Answer: ACD
Explanation:
ORIGIN is a well known mandatory attribute that indicates the origin of the prefix, or rather, the way in which the prefix was injected into BGP. The AS_PATH is a well-known mandatory attribute. The BGP NEXT_HOP is a well-known mandatory attribute.
NEW QUESTION 344
Your customer requests that you provide a transparent Layer 2 service between two of their remote locations. This service must allow the customer to pass tagged traffic from multiple VLANs. You decide to use Q-in-Q tunneling on the two provider edge MX Series routers that connect to the customer's CE devices. Which two statements are true? (Choose two.)
A. As traffic enters the Q-in-Q tunnel on the core-facing interface on the ingress PE device, a push operation is performed.
B. As traffic passes through intermediary P routers in the Q-in-Q tunnel, a push operation is performed.
C. As traffic passes through intermediary P routers in the Q-in-Q tunnel, a swap operation is performed.
D. As traffic enters the Q-in-Q tunnel on the core-facing interface on the ingress PE device, a swap operation is performed.
Answer: AC
Explanation:
Q-in-Q tunneling adds a service VLAN tag before the customer's 802.1Q VLAN tags. The Juniper Networks Junos operating system implementation of Q-in-Q tunneling supports the IEEE 802.1ad standard. In Q-in-Q tunneling, as a packet travels from a customer VLAN (C-VLAN) to a service provider's or data center VLAN (S-VLAN), another 802.1Q tag for the appropriate S-VLAN is added before the C-VLAN tag. The C-VLAN tag remains and is transmitted through the network. As the packet leaves the S-VLAN in the downstream direction, the S-VLAN 802.1Q tag is removed. With the push option, a packet retains its tag and an additional VLAN tag is added. With the swap option, the incoming tag is replaced with an S-VLAN tag. (This is VLAN translation.)
NEW QUESTION 345
In an RSVP-based MPLS network, which ERO type specifies the exact order of routers through which an LSP must travel, without consulting the IGP?
A. loose hop
B. static hop
C. next hop
D. strict hop
Answer: D
Explanation:
When a strict hop is configured, it identifies an exact path through which the LSP must be routed. Strict-hop EROs (Explicit Route Objects) specify the exact order of the routers through which the RSVP messages are sent.
Incorrect Answers:
A: When a loose hop is configured, it identifies one or more transit LSRs through which the LSP must be routed. The network IGP determines the exact route from the inbound router to the first loose hop, or from one loose hop to the next. The loose hop specifies only that a particular LSR be included in the LSP.
NEW QUESTION 346
You are adding IPv6 to an existing IPv4 network running OSPF. Your plan is to use OSPFv3 to route both IPv4 and IPv6 prefixes. Which configuration will enable OSPFv3 to advertise prefixes for both IPv4 and IPv6?
A. user@host# show protocols ospf3
realm ipv4-unicast {
area 0.0.0.0 {
interface ge-0/0/0.0;
}
}
area 0.0.0.0 {
interface ge-0/0/0.0;
}
B. user@host# show protocols ospf3
export ipv4;
area 0.0.0.0 {
interface ge-0/0/0.0;
}
C. user@host# show protocols ospf
area 0.0.0.0 {
interface ge-0/0/0.0;
}
user@host# show protocols ospf3
area 0.0.0.0 {
interface ge-0/0/0.0;
}
D. user@host# show protocols ospf3
rib-group inet.0;
area 0.0.0.0 {
interface ge-0/0/0.0;
}
Answer: A
Explanation:
By default, OSPFv3 supports unicast IPv6 routes, but you can configure OSPFv3 to support multiple address families. To support an address family other than unicast IPv6, you configure a realm that allows OSPFv3 to advertise IPv4 unicast, IPv4 multicast, or IPv6 multicast routes. Example of a configuration which support both Ipv4 and Ipv6 prefixes:
user@host# show protocols ospf3
realm ipv4-unicast {
area 0.0.0.0 {
interface fe-0/1/0.0;
}
}
area 0.0.0.0 {
interface fe-0/1/0.0;
}
NEW QUESTION 347
How many bytes does IP-IP tunneling add to an IP packet?
A. 20
B. 24
C. 16
D. 28
Answer: A
Explanation:
Tunneling increases overhead, because it needs an extra set of IP headers. Typically this is 20 bytes per packet, so if the normal packet size (MTU) on a network is 1500 bytes, a packet that is sent through a tunnel can only be 1480 bytes big.
NEW QUESTION 348
An IS-IS router on a broadcast medium has detected its LSDB is missing an LS PDU. Which action will the router take?
A. The router will send a CSNP to the router that sent it a PSNP with missing PDUs.
B. The router will send a link-state request packet to its closest Level 1/Level2 router.
C. The router will send a PSNP to the router that sent it a CSNP with missing PDUs.
D. The router will send a link-state request packet to its DIS router.
Answer: C
Explanation:
A Partial SNP (PSNP) is similar to CSNP except that it describes only some LSPs rather than the entire database. On a P2P network, PSNP is used to acknowledge received LSPs. On a LAN network, PSNP is used to request missing or latest LSPs.
Incorrect Answers:
A: IS-IS Sequence Number PDU (SNP). SNPs are used to maintain IS-IS LSDB by describing some or all of the LSPs in the database. The DIS periodically multicast Complete SNP (CSNP) to describe all the LSPs in the Pseudonode database.
NEW QUESTION 349
An IS-IS TLV includes which two attributes? (Choose two.)
A. topology
B. vector
C. length
D. value
Answer: CD
Explanation:
Within data communication protocols, optional information may be encoded as a type-length-value or TLV element inside a protocol. TLV is also known as tag-length-value. The type and length are fixed in size (typically 1-4 bytes), and the value field is of variable size. These fields are used as follows:
Type: A binary code, often simply alphanumeric, which indicates the kind of field that this part of the message represents;
Length: The size of the value field (typically in bytes);
Value: Variable-sized series of bytes which contains data for this part of the message.
NEW QUESTION 350
Which two statements are true regarding the output shown in the exhibit? (Choose two.)
[edit interfaces ge-1/0/0]
user@host# show
vlan-tagging;
native-vlan-id 55;
unit 0
{
family bridge
{
interface-mode trunk;
vlan-id-list [ 55 56 ];
}
}
A. The ge-1/0/0 interface will transmit any outgoing frames associated with VLAN 55 as untagged frames.
B. The ge-1/0/0 interface will associate any untagged frames that are received with VLAN 56.
C. The ge-1/0/0 interface will associate any untagged frames that are received with VLAN 55.
D. The ge-1/0/0 interface will transmit any outgoing frames associated with VLAN 56 as untagged frames.
Answer: BD
Explanation:
* You can configure the router to receive and forward single-tag frames, dual-tag frames, or a mixture of single-tag and dual-tag frames. To configure the router to receive and forward single-tag frames with 802.1Q VLAN tags, include the vlan- tagging statement at the [edit interfaces interface-name] hierarchy level:
[edit interfaces interface-name]
vlan-tagging;
* You can configure mixed tagging support for untagged packets on a port. Untagged packets are accepted on the same mixed VLAN-tagged port. To accept untagged packets, include the native-vlan-id statement and the flexible-vlan-tagging statement at the [edit interfaces interface-name] hierarchy level:
[edit interfaces ge-fpc/pic/port]
flexible-vlan-tagging;
native-vlan-id number;
NEW QUESTION 351
Which two LSA types would an ABR generate and send into a totally stubby area? (Choose two.)
A. Type 2 LSA
B. Type 4 LSA
C. Type 5 LSA
D. Type 3 LSA
Answer: AD
Explanation:
A stub area that only allows routes internal to the area and restricts Type 3 LSAs from entering the stub area is often called a totally stubby area. Totally stubby areas can only contain type 1 and 2 LSAs, and a single type 3 LSA.
NEW QUESTION 352
Which statement about Rapid Spanning Tree Protocol (RSTP) is correct?
A. If a device configured for RSTP receives STP BPDUs, it sends STP BPDUs.
B. If a device configured for RSTP receives STP BPDUs, it forwards them as STP BPDUs.
C. If a device configured for RSTP receives STP BPDUs, it continues to send RSTP BPDUs.
D. If a device configured for RSTP receives STP BPDUs, it sends RSTP and STP BPDUs.
Answer: B
Explanation:
Enhancements enable RSTP to achieve sub-second forwarding and network convergence. RSTP is backward-compatible with legacy STP. If legacy STP BPDU is detected on a link, then an RSTP-capable bridge will revert to legacy STP on that given port.
NEW QUESTION 353
Which statement is true about VSTP?
A. Adding VLANs to VSTP consumes more CPU resources.
B. It supports 4093 spanning-tree topologies.
C. It is compatible with PVST+, but not with PVST.
D. Different VLANs must use different spanning-tree topologies.
Answer: A
Explanation:
If you use VLANs, we recommend that you enable MSTP unless your network requires the device compatibility provided by VSTP. Switches configured to run VSTP automatically assign each VLAN to one spanning-tree instance that runs RSTP. While this approach is useful to optimize network usage in small networks with a limited number of VLANs, a VSTP configuration in a network with several hundred VLANs can overload switch CPUs.
NEW QUESTION 354
……
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