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Q251. Which two tunneling techniques determine the IPv4 destination address on a per-packet basis? (Choose two.)
A. 6to4 tunneling
B. ISATAP tunneling
C. manual tunneling
D. GRE tunneling
Answer: A,B
Explanation: Tunnel Configuration Parameters by Tunneling Type
Tunneling Type
Tunnel Configuration Parameter
Tunnel Mode
Tunnel Source
Tunnel Destination
Interface Prefix or Address
Manual
ipv6ip
An IPv4 address, or a reference to an interface on which IPv4 is configured.
An IPv4 address.
An IPv6 address.
GRE/IPv4
gre ip
An IPv4 address.
An IPv6 address.
IPv4-compatible
ipv6ip auto-tunnel
Not required. These are all point-to-multipoint tunneling types. The IPv4 destination address is calculated, on a per-packet basis, from the IPv6 destination.
Not required. The interface address is generated as ::tunnel-source/96.
6to4
ipv6ip 6to4
An IPv6 address. The prefix must embed the tunnel source IPv4 address
ISATAP
ipv6ip isatap
An IPv6 prefix in modified eui-64 format. The IPv6 address is generated from the prefix and the tunnel source IPv4 address.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/ipv6/configuration/guide/12_4t/ipv6_12_4t_book/i p6-tunnel.html
Q252. Which two options are requirements to implement 6VPE? (Choose two.)
A. MPLS between PEs
B. 6-in-4 tunnels between PEs
C. MP-BGP VPNv6 exchange
D. MP-BGP IPv6+label exchange
E. Any Transport over MPLS
F. IPv4/IPv6 dual-stack in core
Answer: A,C
Q253. Which two modes of operation does BFD support? (Choose two.)
A. synchronous mode
B. asynchronous mode
C. demand mode
D. echo mode
E. aggressive mode
F. passive mode
Answer: B,C
Explanation:
A session may operate in one of two modes: asynchronous mode and demand mode. In
asynchronous mode, both endpoints periodically send Hello packets to each other. If a number of those packets are not received, the session is considered down. In demand mode, no Hello packets are exchanged after the session is established; it is assumed that the endpoints have another way to verify connectivity to each other, perhaps on the underlying physical layer. However, either host may still send Hello packets if needed.
Reference: http://en.wikipedia.org/wiki/Bidirectional_Forwarding_Detection
Q254. Refer to the exhibit.
Why is R2 unable to ping the loopback interface of R4?
A. The local preference is too high.
B. The weight is too low.
C. The next hop is not reachable from R2.
D. The route originated from within the same AS.
Answer: C
Explanation:
Before a BGP speaker installs a route to a network in the main IP routing table, the router must know how to reach the next hop that is used to get to that network. Route reachability is verified by searching for a route to the next hop in the main IP routing table. Unlike IGP routing protocols, such as EIGRP and OSPF, which assume that a route is reachable if they learned it through a valid adjacency, BGP does not install routes that it cannot verify as reachable. If a route to the next hop for a BGP network is found in the main IP routing table, BGP assumes that the network is reachable, and that the particular BGP route might be stored in the main IP routing table. If the router receives a route to a network that is not reachable, that route continues to be stored in the incoming BGP table, adj-RIB-In, and might be seen using the show ip bgp command, but is not placed in the main IP routing table.
Reference: https://www.informit.com/library/content.aspx?b=CCIE_Practical_Studies_II&seqNum=75
Q255. Refer to the exhibit.
Which statement about this COS-DSCP mapping is true?
A. The expedited forwarding DSCP is mapped to COS 3.
B. COS 16 is mapped to DSCP 2.
C. The default COS is mapped to DSCP 32.
D. This mapping is the default COS-DSCP mapping on Cisco switches.
Answer: A
Explanation:
Here we see that COS 3 is mapped to DSCP 46, which is the Expedited forwarding class: The Expedited Forwarding (EF) model is used to provide resources to latency (delay) sensitive real-time, interactive traffic. The EF model uses one marking -- DSCP 46.
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Q256. DRAG DROP
Drag and drop the PPPoE packet type on the left to the corresponding description on the right.
Answer:
Q257. Which three statements about bridge assurance are true? (Choose three.)
A. Bridge assurance must be enabled on both ends of a link.
B. Bridge assurance can be enabled on one end of a link or on both ends.
C. Bridge assurance is enabled on STP point-to-point links only.
D. Bridge assurance is enabled on STP multipoint links only.
E. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into a blocking state.
F. If a bridge assurance port fails to receive a BPDU after a timeout, the port is put into an error disabled state.
Answer: A,C,E
Explanation:
Bridge Assurance is enabled by default and can only be disabled globally. Also, Bridge Assurance can be enabled only on spanning tree network ports that are point-to-point links.
Finally, both ends of the link must have Bridge Assurance enabled.
With Bridge Assurance enabled, BPDUs are sent out on all operational network ports, including alternate and backup ports, for each hello time period. If the port does not receive a BPDU for a specified period, the port moves into the blocking state and is not used in the root port calculation. Once that port receives a BPDU, it resumes the normal spanning tree transitions.
Reference:
http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5000/sw/configuration/guid e/cli/CLIConfigurationGuide/SpanningEnhanced.html
Q258. Which two routing protocols are not directly supported by Cisco PfR route control, and rely on the Cisco PfR subfeature PIRO? (Choose two.)
A. BGP
B. EIGRP
C. Static routing
D. OSPF
E. IS-IS
Answer: D,E
Explanation:
Protocol Independent Route Optimization (PIRO) introduced the ability of Performance Routing (PfR) to search for a parent route—an exact matching route, or a less specific route—in the IP Routing Information Base (RIB), allowing PfR to be deployed in any IP-routed environment including Interior Gateway Protocols (IGPs) such as OSPF and IS-IS.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/pfr/configuration/guide/15_1/pfr_15_1_book/pfr-piro.html
Q259. How does EIGRP derive the metric for manual summary routes?
A. It uses the best composite metric of any component route in the topology table.
B. It uses the worst composite metric of any component route in the topology table.
C. It uses the best metric vectors of all component routes in the topology table.
D. It uses the worst metric vectors of all component routes in the topology table.
Answer: A
Explanation:
For example if your router has a routing table like this:
D 192.168.8.0/24 [90/2632528] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.9.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.10.0/24 [90/2195456] via 192.168.0.1, 00:00:12, Serial0/0
D 192.168.11.0/24 [90/2323456] via 192.168.0.1, 00:00:12, Serial0/0
Now suppose you want to manually summarize all the routes above, you can use this command (on the router that advertised these routes to our router):
Router(config-if)#ip summary-address eigrp 1 192.168.8.0 255.255.248.0
After that the routing table of your router will look like this:
D 192.168.8.0/21 [90/2195456] via 192.168.0.1, 00:01:42, Serial0/0
And we can see the manual summary route takes the smallest metric of the specific routes.
Q260. DRAG DROP
Drag and drop the IPv6 multicast feature or protocol on the left to the correct address space on the right.
Answer: