Aug 17, 2021 Step by Step Guide to Prepare for 400-101 Exam BrainDumps
CCIE 400-101 Real Exam Questions and Answers FREE Updated on 2021
NEW QUESTION 74
Which two statements about VRF-lite are true? (Choose two)
- A. It supports MPLS-VRF label exchange and labeled packets.
- B. It should be used when a customer's router is connected to an ISP over OSPF.
- C. It can increase the packet switching rate.
- D. It supports most routing protocols, including EIGRP, ISIS, and OSPF.
- E. It can support multiple customers on a single switch.
Answer: B,E
NEW QUESTION 75
Which feature prevents multicast flooding to routers on a common VLAN that are not a part of the multicast distribution tree for the particular group?
- A. PIM Snooping
- B. IGMP Snooping Querier
- C. PIM-SIM
- D. IGMP Proxy
Answer: A
NEW QUESTION 76
On a network using RIPng, the prefix field of a routing table entry has a value of 0:0:0:0:0:0:0:0.
What does this value signify?
- A. The associated route follows a default route out of the network.
- B. The neighboring router has IPv6 ND disabled.
- C. The next hop address is unknown.
- D. The next hop address is a site-local address.
- E. The next hop address must be the originator of the route advertisement.
Answer: A
Explanation:
Explanation/Reference:
Section: (none)
Explanation/Reference
NEW QUESTION 77 
- A. Option A
- B. Option D
- C. Option B
- D. Option C
Answer: B
NEW QUESTION 78
Drag and Drop the OpenStack projects from the left onto their function on the right?
Answer:
Explanation:
Explanation
NEW QUESTION 79
Which data modeling language is commonly used by NETCONF?
- A. HTML
- B. YANG
- C. XML
- D. REST
Answer: B
Explanation:
Explanation/Reference:
Explanation:
YANG is a data modeling language for the definition of data sent over the NETCONF network configuration
protocol. The name is an acronym for "Yet Another Next Generation". The datamodeling language can be
used to model both configuration data as well as state data of network elements.
References:
NEW QUESTION 80
Which two parameters does the Tunnel Mode Auto Selection feature select automatically?
(Choose two)
- A. the tunneling protocol
- B. the tunnel peer
- C. the transform-set
- D. the ISAKMP profile
- E. the transport protocol
Answer: A,E
NEW QUESTION 81
Which statement is true about conditional advertisements?
- A. Conditional advertisements create routes and withhold them until a predefined condition is met.
- B. Conditional advertisements delete routes when a predefined condition is met.
- C. Conditional advertisements do not create routes, they only withhold them until a predefined condition is met.
- D. Conditional advertisements create routes when a predefined condition is met.
- E. Conditional advertisements create routes when a predefined condition is not met.
Answer: C
Explanation:
The Border Gateway Protocol (BGP) conditional advertisement feature provides additional control of route
advertisement, depending on the existence of other prefixes in the BGP table.
Normally, routes are propagated regardless of the existence of a different path. The BGP conditional advertisement
feature uses the non-exist-map and the advertise-map keywords of the neighbor advertise-map command in order to
track routes by the route prefix. If a route prefix is not present in output of the non-exist-map command, then the
route specified by the advertise-map command is announced. This feature is useful for multihomed networks, in
which some prefixes are advertised to one of the providers only if information from the other provider is not present
(this indicates a failure in the peering session or partial reachability).
Reference: http://www.cisco.com/c/en/us/support/docs/ip/border-gateway-protocol-bgp/16137-cond-adv.html
NEW QUESTION 82
DRAG DROP
Answer:
Explanation:
NEW QUESTION 83
Which two statements are true about unicast RPF? (Choose two.)
- A. Unicast RPF strict mode supports asymmetric paths.
- B. Unicast RPF strict mode works better with multihomed networks.
- C. CEF is optional with Unicast RPF, but when CEF is enabled it provides better performance.
- D. Unicast RPF strict mode supports symmetric paths.
- E. Unicast RPF requires CEF to be enabled.
Answer: D,E
Explanation:
Explanation/Reference:
Explanation:
Unicast RPF requires Cisco express forwarding (CEF) to function properly on the router.
Strict Versus Loose Checking Mode
The Unicast RPF in Strict Mode feature filters ingress IPv4 traffic in strict checking mode and forwards packets only if the following conditions are satisfied.
An IPv4 packet must be received at an interface with the best return path (route) to the packet source (a process called symmetric routing). There must be a route in the Forwarding Information Base (FIB) that matches the route to the receiving interface. Adding a route in the FIB can be done via static route, network statement, or dynamic routing.
IPv4 source addresses at the receiving interface must match the routing entry for the interface.
References:
http://www.cisco.com/c/en/us/td/docs/ios/12_2/security/configuration/guide/fsecur_c/scfrpf.html http:// www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/srpf_gsr.html
NEW QUESTION 84
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 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.
- B. The next-hop ip address 110.100.1.1 is not directly attached to the redistributing router.
- C. The interface Ethernet0/1 is in down state.
- 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-firstospf/13682-10.html
NEW QUESTION 85
Which three options are components of an EEM CLI policy? (Choose three.)
- A. Safe-Tcl
- B. Tcl bytecode
- C. applet name
- D. action
- E. Fast Tcl
- F. event
Answer: C,D,F
NEW QUESTION 86
Which statement is true about IGMP?
- A. Multicast receivers send IGMP messages to signal their interest to receive traffic for specific multicast groups.
- B. IGMP messages are encapsulated in PIM register messages and sent to the RP.
- C. Multicast sources send IGMP messages to their first-hop router, which then generates a PIM join message that is then sent to the RP.
- D. Multicast receivers send IGMP messages to their first-hop router, which then forwards the IGMP messages to the RP.
Answer: A
Explanation:
In the example shown above, the receivers (the designated multicast group) are interested in receiving the video data stream from the source. The receivers indicate their interest by sending an Internet Group Management Protocol (IGMP) host report to the routers in the network. The routers are then responsible for delivering the data from the source to the receivers.
Reference:
http://www.cisco.com/c/en/us/td/docs/ios/solutions_docs/ip_multicast/White_papers/mcst_o vr.html
NEW QUESTION 87
Which statement best describes IPv6 RA Guard?
- A. It validates ingress hello messages on a port
- B. It redirects authorized device hello messages
- C. It blocks unexpected IPv6 router announcements on a link
- D. It filters authorized IPv6 device advertisements on a link
Answer: C
NEW QUESTION 88
Which three statements are true about an EtherChannel? (Choose three.)
- A. LACP can operate in both half duplex and full duplex, if the duplex setting is the same on both ends.
- B. Ports with different spanning-tree path costs can form an EtherChannel.
- C. PAGP and LACP can be configured on the same switch if the switch is not in the same EtherChannel.
- D. EtherChannel ports in suspended state can receive BPDUs but cannot send them.
- E. An EtherChannel forms between trunks that are using different native VLANs.
Answer: B,C,D
Explanation:
Explanation/Reference:
Explanation:
Answer A: EtherChannel groups running PAgP and LACP can coexist on the same switch or on different switches in the stack. Individual EtherChannel groups can run either PAgP or LACP, but they cannot interoperate.
Answer B:
EtherChannel Member Port States
Port States
Description
bundled
The port is part of an EtherChannel and can send and receive BPDUs and data traffic.
suspended
The port is not part of an EtherChannel. The port can receive BPDUs but cannot send them. Data traffic is blocked.
standalone
The port is not bundled in an EtherChannel. The port functions as a standalone data port. The port can send and receive BPDUs and data traffic.
Answer E: Ports with different spanning-tree path costs can form an EtherChannel if they are otherwise compatibly configured. Setting different spanning-tree path costs does not, by itself, make ports incompatible for the formation of an EtherChannel.
Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960x/software/15-0_2_EX/layer2/ configuration_guide/b_lay2_152ex_2960-x_cg/b_lay2_152ex_2960- x_cg_chapter_010.html
http://www.ensurepass.com
NEW QUESTION 89
Which regular expression will only allow prefixes that originated from AS 65000 and that are learned through AS 65001?
- A. 65000_65001$
- B. ^65000_65001
- C. ^65001_65000$
- D. ^65000_65001$
Answer: C
NEW QUESTION 90
Which three message types are used for prefix delegation in DHCPv6? (Choose three.)
- A. Advertise
- B. Renew
- C. DHCP Discover
- D. DHCP Offer
- E. Solicit
- F. DHCP Ack
Answer: A,B,E
NEW QUESTION 91
Which three statements about the default behaviour of eBGP sessions are true? (Choose three.)
- A. When a route reflector reflects a route to a client, it transmits the next hop unchanged.
- B. The next hop in an eBGP peering is the loopback address of the neighbor that announced the route.
- C. The next hop in an eBGP peering is the IP address of the neighbor that announced the route.
- D. eBGP sessions between sub-ASs in different confederations transmit the next hop unchanged.
- E. The next hop in an eBGP peering is the loopback address of the interface that originated the route.
- F. When a route reflector reflects a route to a client, it changes the next hop to its own address.
Answer: A,C,D
NEW QUESTION 92
Which regular expression will match prefixes from the AS 200 that is directly connected to our AS?
- A. ^$
- B. _200$
- C. ^200)
- D. _200_
- E. ^200_
Answer: E
Explanation:
Explanation/Reference:
Explanation:
NEW QUESTION 93
Refer to the exhibit.
Why is the neighbor relationship between R1 & R2 and R1 & R3 an L2-type neighborship?
- A. because the network type between R1, R2, and R3 is point-to-point
- B. because the circuit type on those three routers is L1/L2
- C. because the hello interval is not the same on those three routers
- D. because the area ID on R1 is different as compared to the area ID of R2 and R3
Answer: D
Explanation:
With IS-IS, an individual router is in only one area, and the border between areas is on the link that connects two routers that are in different areas. A Level 2 router may have neighbors in the same or in different areas, and it has a Level 2 link-state database with all information for inter-area routing. Level 2 routers know about other areas but will not have Level 1 information from its own area.
Reference. http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml
NEW QUESTION 94
Which value docs EIGRP use to determine the metric for a summary address?
- A. The lowest metric among the component routes
- B. A default fixed value
- C. The average of the component metrics
- D. The highest metric among the component routes
Answer: A
NEW QUESTION 95
Which statement about OSPF multiaccess segments is true?
- A. The designated router is elected first.
- B. The router that sent the first hello message is elected first.
- C. The designated and backup designated routers are elected at the same time.
- D. The backup designated router is elected first.
Answer: D
Explanation:
Explanation/Reference:
According to the RFC, the BDR is actually elected first, followed by the DR. The RFC explains why:
"
The reason behind the election algorithm's complexity is the desire for an orderly transition from Backup Designated Router to Designated Router, when the current Designated Router fails. This orderly transition is ensured through the introduction of hysteresis: no new Backup Designated Router can be chosen until the old Backup accepts its new Designated Router responsibilities. The above procedure may elect the same router to be both Designated Router and Backup Designated Router, although that router will never be the calculating router (Router X) itself." Reference: http://www.ietf.org/rfc/rfc2328.txt Page 76
NEW QUESTION 96
Refer to Exhibit.
What conclusion can you draw from the oven ping output?
- A. ping operation sent packets ranging from 506 to 1500 bytes in size
- B. packet life was exceeded in 5 percent of the operations
- C. Fragmentation failed during the ping operation
- D. Verbose option was set in the IP header
Answer: C
NEW QUESTION 97
Which statement about WAN Ethernet Services is true?
- A. Ethernet multipoint services function as a multipoint-to-multipoint VLAN-based connection.
- B. Point-to-point processing and encapsulation are performed on the customer network.
- C. UNIs can perform service multiplexing and all-in-one bundling.
- D. Rate-limiting can be configured per EVC.
Answer: D
NEW QUESTION 98
Refer to the exhibit.
Router A is connected as BGP neighbor to routers B and C.
Which path does router A use to get to AS 65010?
- A. through router B because the default local preference is 500 and higher than router C.
- B. through router B because ii has the shortest AS path.
- C. through router C because it has a higher local preference.
- D. will load balance because both routes have the same Med value.
Answer: C
NEW QUESTION 99
......
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