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2021 Jan 400-101 ccie written passing score:
Q361. Refer to the exhibit.
Which part of the joined group addresses list indicates that the interface has joined the EIGRP multicast group address?
A. FF02::1
B. FF02::1:FF00:200
C. FF02::A
D. FF02::2
Answer: C
Explanation:
FF02::A is an IPv6 link-local scope multicast addresses. This address is for all devices on a wire that want to "talk" EIGRP with one another.
Focusing specifically on FF02::A and how routers join it, we can see and say three things:
. Local: FF02::A is local to the wire.
. Join: Each device "joins" FF02::A by just "deciding to listen" to the IPv6 link-local scope multicast address FF02::A. Then, by extension, it listens to the corresponding MAC address for that multicast IPv6 address (33:33:00:00:00:0A).
. Common interest: As we can see, these varying groups have something in common that they would all like to hear about. For FF02::A, the common interest --the "connection" among the devices joining that group – is that they all want to listen to or participate in EIGRP.
Reference: http://www.networkcomputing.com/networking/understanding-ipv6-what-is-solicited-node-multicast/a/d-id/1315703
Q362. Which two metrics are measured with active probes when PfR voice traffic optimization is in use? (Choose two.)
A. MOS
B. cost
C. jitter
D. bandwidth
Answer: A,C
Q363. DRAG DROP
Drag and drop each PHB on the left to the functionality it performs on the right.
Answer:
Q364. Which two options are actions that EEM can perform after detecting an event? (Choose two.)
A. Place a port in err-disabled.
B. Generate an SNMP trap.
C. Reload the Cisco IOS Software.
D. Send an SMS.
Answer: B,C
Explanation:
action snmp-trap
To specify the action of generating a Simple Network Management Protocol (SNMP) trap when an Embedded Event Manager (EEM) applet is triggered, use the action snmp-trap command in applet configuration mode.
ction reload
To specify the action of reloading the Cisco IOS software when an Embedded Event Manager (EEM) applet is triggered, use the action reload command in applet configuration mode.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2s/feature/guide/fs_eem2.html
Q365. Refer to the exhibit.
Which option explains why the forwarding address is set to 0.0.0.0 instead of 110.100.1.1?
A. The interface Ethernet0/1 is in down state.
B. The next-hop ip address 110.100.1.1 is not directly attached to the redistributing router.
C. The next-hop interface (Ethernet0/1) is specified as part of the static route command; therefore, the forwarding address is always set to 0.0.0.0.
D. OSPF is not enabled on the interface Ethernet0/1.
Answer: D
Explanation:
From the output of the “show ip ospf database” command (although this command is not shown) we can conclude this is an ASBR (with Advertising Router is itself) and E0/1 is the ASBR’s next hop interface for other routers to reach network 192.168.10.0.
The Forwarding Address is determined by these conditions:
* The forwarding address is set to 0.0.0.0 if the ASBR redistributes routes and OSPF is not enabled on the next hop interface for those routes.
* These conditions set the forwarding address field to a non-zero address:
+ OSPF is enabled on the ASBR’s next hop interface AND
+ ASBR’s next hop interface is non-passive under OSPF AND
+ ASBR’s next hop interface is not point-to-point AND
+ ASBR’s next hop interface is not point-to-multipoint AND
+ ASBR’s next hop interface address falls under the network range specified in the router ospf command.
* Any other conditions besides these set the forwarding address to 0.0.0.0.
-> We can see E0/1 interface is not running OSPF because it does not belong to network 110.110.0.0 0.0.255.255 which is declared under OSPF process -> F.A address is set to 0.0.0.0.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13682-10.html
Replace latest ccie r&s dumps:
Q366. A floating static route appears in the routing table of an interface even when the interface is unusable.
Which action can you take to correct the problem?
A. Remove the permanent option from the static route.
B. Correct the administrative distance.
C. Configure the floating static route to point to another route in the routing table.
D. Correct the DHCP-provided route on the DHCP server.
Answer: A
Q367. Refer to the exhibit.
You are bringing a new MPLS router online and have configured only what is shown to bring LDP up. Assume that the peer has been configured in a similar manner. You verify the LDP peer state and see that there are no neighbors. What will the output of show mpls ldp discovery show?
A. Interfaces:
Ethernet0/0 (ldp): xmit
B. Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 25.25.25.2:0; IP addr: 192.168.12.2
C. Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 192.168.12.2:0; no route
D. Interfaces:
Ethernet0/0 (ldp): xmit/recv
LDP Id: 25.25.25.2:0; no route
Answer: D
Q368. When BGP route reflectors are used, which attribute ensures that a routing loop is not created?
A. weight
B. local preference
C. multiexit discriminator
D. originator ID
Answer: D
Explanation:
As the iBGP learned routes are reflected, routing information may loop. The route reflector model has the following mechanisms to avoid routing loops:
. Originator ID is an optional, nontransitive BGP attribute. It is a 4-byte attributed created by a route reflector. The attribute carries the router ID of the originator of the route in the local autonomous system. Therefore, if a misconfiguration causes routing information to come back to the originator, the information is ignored.
. Cluster-list is an optional, nontransitive BGP attribute. It is a sequence of cluster IDs that the route has passed. When a route reflector reflects a route from its clients to nonclient peers, and vice versa, it appends the local cluster ID to the cluster-list. If the cluster-list is empty, a new cluster-list is created. Using this attribute, a route reflector can identify if routing information is looped back to the same cluster due to misconfiguration. If the local cluster ID is found in the cluster-list, the advertisement is ignored.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/ip/configuration/guide/fipr_c/1cfbgp.html
Q369. Which two advantages does CoPP have over receive path ACLs? (Choose two.)
A. Only CoPP applies to IP packets and non-IP packets.
B. Only CoPP applies to receive destination IP packets.
C. A single instance of CoPP can be applied to all packets to the router, while rACLs require multiple instances.
D. Only CoPP can rate-limit packets.
Answer: A,D
Explanation:
Control Plane Policing – CoPP is the Cisco IOS-wide route processor protection mechanism. As illustrated in Figure 2, and similar to rACLs, CoPP is deployed once to the punt path of the router. However, unlike rACLs that only apply to receive destination IP packets, CoPP applies to all packets that punt to the route processor for handling. CoPP therefore covers not only receive destination IP packets, it also exceptions IP packets and non-IP packets. In addition, CoPP is implemented using the Modular QoS CLI (MQC) framework for policy construction. In this way, in addition to simply permit and deny functions, specific packets may be permitted but rate-limited. This behavior substantially improves the ability to define an effective CoPP policy. (Note: that “Control Plane Policing” is something of a misnomer because CoPP generally protects the punt path to the route processor and not solely the control plane.)
Reference: http://www.cisco.com/web/about/security/intelligence/coppwp_gs.html
Q370. Like OSPFv2, OSPFv3 supports virtual links. Which two statements are true about the IPv6 address of a virtual neighbor? (Choose two.)
A. It is the link-local address, and it is discovered by examining the hello packets received from the virtual neighbor.
B. It is the link-local address, and it is discovered by examining link LSA received by the virtual neighbor.
C. It is the global scope address, and it is discovered by examining the router LSAs received by the virtual neighbor.
D. Only prefixes with the LA-bit not set can be used as a virtual neighbor address.
E. It is the global scope address, and it is discovered by examining the intra-area-prefix-LSAs received by the virtual neighbor.
F. Only prefixes with the LA-bit set can be used as a virtual neighbor address.
Answer: E,F
Explanation:
OSPF for IPv6 assumes that each router has been assigned link-local unicast addresses on each of the router's attached physical links. On all OSPF interfaces except virtual links, OSPF packets are sent using the interface's associated link-local unicast address as the source address. A router learns the link-local addresses of all other routers attached to its links and uses these addresses as next-hop information during packet forwarding. On virtual links, a global scope IPv6 address MUST be used as the source address for OSPF protocol packets. The collection of intra-area-prefix-LSAs originated by the virtual neighbor is examined, with the virtual neighbor's IP address being set to the first prefix encountered with the LA-bit set.
Reference: https://tools.ietf.org/html/rfc5340