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2021 Dec ccie written dumps 400-101:
Q411. Which three options are results of the command no mpls ip propagate-ttl? (Choose three.)
A. It prevents the TTL from being copied from the IP header to the MPLS header.
B. It prevents the MPLS hops from being visible to a CE router when you perform a traceroute.
C. A fixed TTL value of 255 is used for the first label of the IP packet.
D. It prevents the TTL from being copied from the MPLS header back into the IP header.
E. MPLS hops remain visible on a CE router when you perform a traceroute.
F. A fixed TTL value of 1 is used for the first label of the IP packet.
Answer: A,B,C
Q412. Which option describes the purpose of the leak-map keyword in the command eigrp stub connected leak-map EigrpLeak?
A. It allows the specified static routes to be advertised.
B. It allows exceptions to the route summarization that is configured.
C. It allows specified EIGRP-learned routes to be advertised.
D. It restricts specified connected routes from being advertised.
Answer: C
Explanation:
ExamplE. eigrp stub leak-map Command
In the following example, the eigrp stub command is issued with the leak-map name keyword-argument pair to configure the device to reference a leak map that identifies routes to be advertised that would have been suppressed otherwisE.
Device(config)# router eigrp 1
Device(config-router)# network 10.0.0.0
Device(config-router)# eigrp stub leak-map map1
Reference: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_eigrp/configuration/15-mt/ire-15-mt-book/ire-eigrp-stub-rtg.html#GUID-FB899CA9-E9DE-48D8-8048-C971179E4E24
Q413. Refer to the exhibit.
Which two statements about the output are true? (Choose two.)
A. 802.1D spanning tree is being used.
B. Setting the priority of this switch to 0 for VLAN 1 would cause it to become the new root.
C. The hello, max-age, and forward delay timers are not set to their default values.
D. Spanning-tree PortFast is enabled on GigabitEthernet1/1.
Answer: A,B
Explanation:
802.1D is the standard for Spanning tree, which is being used here. For priority, The priority order starts from 0 (yes, 0 is valid) and then increases in 4096. 0, 4096, 8192, 12288, …. Etc.
The lower the number is, the higher is the priority. Here we see that the current root has a priority of 8192, so configuring this with a priority of 0 will make it the new root.
Q414. Which two statements about TCP are true? (Choose two.)
A. TCP option must be divisible by 32.
B. It has a 16-bit window size.
C. Its maximum data offset is fifteen 32-bit words.
D. It has a 32-bit window size.
E. Its maximum data offset is ten 32-bit words.
F. It has a 32-bit checksum field.
Answer: B,C
Q415. Refer to the exhibit.
Which statement is true?
A. The Cisco PfR state is UP; however, the external interface Et0/1 of border router 10.1.1.1 has exceeded the maximum available bandwidth threshold.
B. The Cisco PfR state is UP; however, an issue is preventing the border router from establishing a TCP session to the master controller.
C. The Cisco PfR state is UP and is able to monitor traffic flows; however, MD5 authentication has not been successful between the master controller and the border routers.
D. The Cisco PfR State is UP; however, the receive capacity was not configured for inbound traffic.
E. The Cisco PfR state is UP, and the link utilization out-of-policy threshold is set to 90 percent for traffic exiting the external links.
Answer: E
Explanation:
All three interfaces show as UP, and the capacity is set to 500 kbps, with the max threshold set to 450 kbps (90% of 500kbps).
Avant-garde ccie 400 101:
Q416. Which command enables L2 QoS support in all VLANs (including the native VLAN)?
A. switchport priority extend cos
B. mls qos trust dscp
C. mls qos rewrite ip dscp
D. switchport trunk native vlan tag
Answer: D
Explanation:
You can enter the switchport trunk native vlan tag command to enable the tagging of native VLAN traffic on a per-port basis. When tagging is enabled, all the packets on the native VLAN are tagged and all incoming untagged data packets are dropped, but untagged control packets are accepted. When tagging is enabled, it will allow for L2 QoS support in all VLANs, including the native VLAN.
Q417. Which three statements about GET VPN are true? (Choose three.)
A. It encrypts WAN traffic to increase data security and provide transport authentication.
B. It provides direct communication between sites, which reduces latency and jitter.
C. It can secure IP multicast, unicast, and broadcast group traffic.
D. It uses a centralized key server for membership control.
E. It enables the router to configure tunnels.
F. It maintains full-mesh connectivity for IP networks.
Answer: A,B,D
Explanation:
Cisco GET VPN Features and Benefits
Feature
Description and Benefit
Key Services
Key Servers are responsible for ensuring that keys are granted to authenticated and authorized devices only. They maintain the freshness of the key material, pushing re-key messages as well as security policies on a regular basis. The chief characteristics include:
. Key Servers can be located centrally, granting easy control over membership.
. Key Servers are not in the "line of fire" - encrypted application traffic flows directly between VPN end points without a bottleneck or an additional point of failure.
. Supports both local and global policies, applicable to all members in a group - such as "Permit any any", a policy to encrypt all traffic.
. Supports IP Multicast to distribute and manage keys, for improved efficiency; Unicast is also supported where IP Multicast is not possible.
Scalability and Throughput
. The full mesh nature of the solution allows devices to communicate directly with each other, without requiring transport through a central hub; this minimizes extra encrypts and decrypts at the hub router; it also helps minimize latency and jitter.
. Efficient handling of IP Multicast traffic by using the core network for replication can boost effective throughput further
Security
Provides data security and transport authentication, helping to meet security compliance and internal regulation by encrypting all WAN traffic
Reference: http://www.cisco.com/c/en/us/products/collateral/security/group-encrypted-transport-vpn/product_data_sheet0900aecd80582067.html
Q418. What two values are required to implement an EIGRP named configuration? (Choose two.)
A. virtual-instance-name
B. address-family
C. router-id
D. subnet-mask
E. process-id
Answer: A,B
Q419. Which two options are causes of out-of-order packets? (Choose two.)
A. a routing loop
B. a router in the packet flow path that is intermittently dropping packets
C. high latency
D. packets in a flow traversing multiple paths through the network
E. some packets in a flow being process-switched and others being interrupt-switched on a transit router
Answer: D,E
Explanation:
In traditional packet forwarding systems, using different paths have varying latencies that cause out of order packets, eventually resulting in far lower performance for the network application. Also, if some packets are process switched quickly by the routing engine of the router while others are interrupt switched (which takes more time) then it could result in out of order packets. The other options would cause packet drops or latency, but not out of order packets.
Q420. Refer to the exhibit.
Which two pieces of information in this Wireshark capture indicate that you are viewing EIGRP traffic? (Choose two.)
A. the header length
B. the protocol number
C. the destination address
D. the Class Selector
E. the source address
F. the header checksum
Answer: B,C
Explanation:
EIGRP uses protocol number 88, which shows as EIGRP in the capture. Also, we in the capture that the destination IP address is 224.0.0.10, which is the Enhanced Interior Gateway Routing Protocol (EIGRP) group address is used to send routing information to all EIGRP routers on a network segment.