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2021 Jan latest ccie r&s dumps:
Q151. Which measure does IS-IS use to avoid sending traffic with a wrong MTU configuration?
A. IS-IS does not protect from MTU mismatch.
B. MTU value is communicated in IS-IS Sequence Number PDUs (SNP), and IS-IS adjacency is not established if an MTU mismatch is detected.
C. IS-IS uses path MTU discovery as specified in RFC 1063.
D. IS-IS uses padding of hello packets to full MTU.
Answer: D
Explanation:
Intermediate System-to-Intermediate System (IS-IS) hellos are padded to the full maximum transmission unit (MTU) size. The benefit of padding IS-IS Hellos (IIHs) to the full MTU is that it allows for early detection of errors due to transmission problems with large frames or due to mismatched MTUs on adjacent interfaces.
Reference: http://www.cisco.com/c/en/us/support/docs/ip/integrated-intermediate-system-to-intermediate-system-is-is/47201-isis-mtu.html
Q152. Which two statements are characteristics of Ethernet private LAN circuits? (Choose two.)
A. They support communication between two or more customer endpoints.
B. They utilize more than one bridge domain.
C. They support point-to-multipoint EVC.
D. They support multipoint-to-multipoint EVC.
Answer: A,D
Explanation:
An Ethernet Private LAN (EPLAN) is a multipoint–to–multipoint EVC. EPLAN is an EVC that supports communication between two or more UNIs. In EPLAN, only one EVC can exist on a port and the port can have only one EFP.
Reference: https://www.cisco.com/c/en/us/td/docs/optical/cpt/r9_3/configuration/guide/cpt93_configurat ion/cpt93_configuration_chapter_0100.pdf
Q153. Refer to the exhibit.
What password will be required to enter privileged EXEC mode on a device with the given configuration?
A. ciscotest
B. ciscocert
C. cisco
D. ciscors
E. ciscoccie
Answer: A
Q154. DRAG DROP
Drag and drop the Cisco IOS XE subpackage on the left to the function it performs on the right.
Answer:
Q155. Which two actions can you take to recover an interface in a errdisable state? (Choose two.)
A. Enable UDLD on the switch.
B. Enable errdisable recovery on the switch.
C. Execute the shutdown command on the interface, followed by the no shutdown command.
D. Remove the related commands from the configuration and reenter them.
E. Enable loop guard on the switch.
Answer: B,C
Rebirth ccie written dumps 400-101:
Q156. A configuration includes the line ip nbar port-map SSH tcp 22 23 443 8080. Which option describes the effect of this configuration line?
A. It configures NBAR to search for SSH using ports 22, 23, 443, and 8080.
B. It configures NBAR to allow SSH connections only on ports 22, 23, 443, and 8080.
C. It enables NBAR to inspect for SSH connections.
D. It creates a custom NBAR port-map named SSH and associates TCP ports 22, 23, 443, and 8080 to itself.
Answer: A
Explanation:
The ip nbar-port-map command configures NBAR to search for a protocol or protocol name using a port number other than the well-known port.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_2/qos/command/reference/fqos_r/qrfcmd10.pd f
Q157. What are the two requirements for BGP to install a classful network into the BGP routing table? (Choose two)
A. The AS contains the entire classfull network.
B. A classful network statement with a lower administrative distance is in the routing table.
C. Auto-summary is enabled.
D. A classful network statement with a classful mask is in the routing table.
E. Synchronization is enabled.
F. Synchronization is disabled.
Answer: C,D
Q158. Which two loop-prevention mechanisms are implemented in BGP? (Choose two.)
A. A route with its own AS in the AS_PATH is dropped automatically if the route reenters its own AS.
B. A route with its own cluster ID in the CLUSTER_LIST is dropped automatically when the route reenters its own AS.
C. The command bgp allowas-in enables a route with its own AS_PATH to be dropped when it reenters its own AS.
D. The command bgp bestpath as-path ignore enables the strict checking of AS_PATH so that they drop routes with their own AS in the AS_PATH.
E. The command bgp bestpath med missing-as-worst assigns the smallest possible MED, which directly prevents a loop.
Answer: A,B
Explanation:
When dealing with the possibility of routing updates making their way back into an AS, BGP relies on the information in the AS_path for loop detection. An update that tries to make its way back into the AS it was originated from will be dropped by the border router. With the introduction of route reflectors, there is a potential for having routing loops within an AS. A routing update that leaves a cluster might find its way back inside the cluster. Loops inside the AS cannot be detected by the traditional AS_path approach because the routing updates have not left the AS yet. BGP offers two extra measures for loop avoidance inside an AS when route reflectors are configured.
Using an Originator ID
The originator ID is a 4-byte, optional, nontransitive BGP attribute (type code 9) that is created by the route reflector. This attribute carries the router ID of the originator of the route in the local AS. If, because of poor configuration, the update comes back to the originator, the originator ignores it.
Using a Cluster List
The cluster list is an optional, nontransitive BGP attribute (type code 10). Each cluster is represented with a cluster ID.
A cluster list is a sequence of cluster IDs that an update has traversed. When a route reflector sends a route from its clients to nonclients outside the cluster, it appends the local cluster ID to the cluster list. If the route reflector receives an update whose cluster list contains the local cluster ID, the update is ignored. This is basically the same concept as the AS_path list applied between the clusters inside the AS.
Reference: http://borg.uu3.net/cisco/inter_arch/page11.html
Q159. Which statement about the EIGRP RTO is true?
A. It is six times the SRTT.
B. It is the time that it normally takes for an update to be received by a peer.
C. It is the time that it normally takes to receive a reply to a query.
D. It is the average time that it takes for a reliable packet to be acknowledged.
Answer: A
Explanation:
The RTO is typically six times the SRTT, the value may vary from a minimum of 200 microseconds (ms) to a maximum of 5 seconds (s).
Reference: EIGRP for IP: Basic Operation and Configuration, Alvaro Retana, Russ White, Don Slice - 2000
Q160. Refer to the exhibit.
If the network switch is configured as shown, which two statements about network traffic are true? (Choose two.)
A. Traffic enters the shaper on a FIFO basis.
B. Traffic enters the shaper on a weighted fair queueing basis.
C. Drop behavior is random for traffic in excess of 6 Mbps.
D. Voice traffic is given priority until it reaches 1.5 Mbps.
E. Voice traffic is given priority until it reaches 6 Mbps.
Answer: A,D
Explanation:
A. Serial interfaces at E1 (2.048 Mbps) and below use weighted fair queueing (WFQ) by default. Other interfaces use first-in first-out (FIFO) by default.
D. Voice traffic is given priority up to 25% of the shape average value, which is 6000000, so 25% of 6 Mbps is 1.5 Mbps.