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2021 Mar 400-101 exam question
Q261. 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
Q262. Refer to the exhibit.
What is wrong with the configuration of the tunnel interface of this DMVPN Phase II spoke router?
A. The interface MTU is too high.
B. The tunnel destination is missing.
C. The NHRP NHS IP address is wrong.
D. The tunnel mode is wrong.
Answer: D
Explanation:
By default, tunnel interfaces use GRE as the tunnel mode, but a DMVPN router needs to be configured for GRE multipoint by using the “tunnel mode gre multipoint” interface command.
Q263. DRAG DROP
Drag and drop the extended ping command field on the left to its usage on the right.
Answer:
Q264. Which two statements about MAC ACLs are true? (Choose two.)
A. They support only inbound filtering.
B. They support both inbound and outbound filtering.
C. They are configured with the command mac access-list standard.
D. They can filter non-IP traffic on a VLAN and on a physical interface.
Answer: A,D
Explanation:
MAC ACL, also known as Ethernet ACL, can filter non-IP traffic on a VLAN and on a physical Layer 2 interface by using MAC addresses in a named MAC extended ACL. The steps to configure a MAC ACL are similar to those of extended named ACLs. MAC ACL supports only inbound traffic filtering.
Reference: http://www.ciscopress.com/articles/article.asp?p=1181682&seqNum=4
Q265. Which option describes how a router responds if LSA throttling is configured and it receives the identical LSA before the interval is set?
A. The LSA is added to the OSPF database and a notification is sent to the sending router to slow down its LSA packet updates.
B. The LSA is added to the OSPF database.
C. The LSA is ignored.
D. The LSA is ignored and a notification is sent to the sending router to slow down its LSA packet updates.
Answer: C
Explanation:
How OSPF LSA Throttling Works
The timers throttle lsa all command controls the generation (sending) of LSAs. The first LSA is always generated immediately upon an OSPF topology change, and the next LSA generated is controlled by the minimum start interval. The subsequent LSAs generated for the same LSA are rate-limited until the maximum interval is reached. The "same LSA" is defined as an LSA instance that contains the same LSA ID number, LSA type, and advertising router ID.
The timers LSA arrival command controls the minimum interval for accepting the same LSA. If an instance of the same LSA arrives sooner than the interval that is set, the LSA is dropped. It is recommended that the arrival interval be less than or equal to the hold-time interval of the timers throttle lsa all command.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fsolsath.html
Up to date 400-101 download:
Q266. Refer to the exhibit.
What does the return code 3 represent in this output?
A. The mapping of the replying router for the FEC is different.
B. The packet is label-switched at stack depth.
C. The return code is reserved.
D. The upstream index is unknown.
E. The replying router was the proper egress for the FEC.
Answer: E
Explanation:
Return Codes The Return Code is set to zero by the sender. The receiver can set it to one of the values listed below. The notation <RSC> refers to the Return Subcode. This field is filled in with the stack-depth for those codes that specify that. For all other codes, the Return Subcode MUST be set to zero.
Value Meaning
0 No return code
1 Malformed echo request received
2 One or more of the TLVs was not understood
3 Replying router is an egress for the FEC at stack-depth <RSC>
4 Replying router has no mapping for the FEC at stack-depth <RSC>
Reference: https://www.ietf.org/rfc/rfc4379.txt
Q267. Which three features require Cisco Express Forwarding? (Choose three.)
A. NBAR
B. AutoQoS
C. fragmentation
D. MPLS
E. UplinkFast
F. BackboneFast
Answer: A,B,D
Explanation:
QoS Features That Require CEF
These class-based QoS features are supported only on routers that run CEF.
.Network Based Application Recognition (NBAR) provides intelligent network classification. For more information, refer to Network Based Application Recognition.
. The AutoQoS -VoIP feature simplifies and speeds up the implementation and provisioning of QoS for VoIP traffic. This feature is enabled with the help of the auto qos voip command. CEF must be enabled at the interface or ATM PVC before the auto qos command can be used. For more information about this feature and its prerequisites, refer to AutoQoS -VoIP.
From MPLS Fundamentals - Luc De Ghein
Why Is CEF Needed in MPLS Networks?
Concerning MPLS, CEF is special for a certain reason; otherwise, this book would not explicitly cover it. Labeled packets that enter the router are switched according to the label forwarding information base (LFIB) on the router. IP packets that enter the router are switched according to the CEF table on the router. Regardless of whether the packet is switched according to the LFIB or the CEF table, the outgoing packet can be a labeled packet or an IP packet
Reference: http://www.cisco.com/c/en/us/support/docs/asynchronous-transfer-mode-atm/ip-to-atm-class-of-service/4800-cefreq.html
Q268. Which two options about PIM-DM are true? (Choose two.)
A. PIM-DM initally floods multicast traffic throughout the network.
B. In a PIM-DM network, routers that have no upstream neighbors prune back unwanted traffic.
C. PIM-DM supports only shared trees.
D. PIM-DM uses a pull model to deliver multicast traffic.
E. PIM-DM cannot be used to build a shared distribution tree.
Answer: A,E
Q269. 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.
Q270. DRAG DROP
Drag and drop the Metro Ethernet circuit on the left to the corresponding Service Type category on the right.
Answer: