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[2021] 400-101 PDF Questions - Perfect Prospect To Go With PassLeaderVCE Practice Exam
NEW QUESTION 29
When you configure the ip pmtu command under an L2TPv3 pseudowire class, which two things can happen when a packet exceeds the L2TP path MTU? (Choose two.)
- A. The router always fragments the packet after L2TP/IP encapsulation.
- B. The router fragments the packet after L2TP/IP encapsulation only if the DF bit is set to 0.
- C. The router drops the packet and sends an ICMP unreachable message back to the sender only if the DF bit is set to 1.
- D. The router fragments the packet before L2TP/IP encapsulation only if the DF bit is set to 0.
- E. The router drops the packet.
- F. The router always fragments the packet before L2TP/IP encapsulation.
Answer: C,D
Explanation:
If you enable the ip pmtu command in the pseudowire class, the L2TPv3 control channel participates in the path MTU discovery. When you enable this feature, the following processing is performed:
-
ICMP unreachable messages sent back to the L2TPv3 router are deciphered and the tunnel MTU is updated accordingly. In order to receive ICMP unreachable messages for fragmentation errors, the DF bit in the tunnel header is set according to the DF bit value received from the CE, or statically if the ip dfbit set option is enabled. The tunnel MTU is
periodically reset to the default value based on a periodic timer.
-
ICMP unreachable messages are sent back to the clients on the CE side. ICMP unreachable messages are sent to the CE whenever IP packets arrive on the CE-PE interface and have a packet size greater than the tunnel MTU. A Layer 2 header calculation is performed before the ICMP unreachable message is sent to the CE.
Reference: http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/l2tpv325.html338
NEW QUESTION 30
Which Carrier Ethernet service supports the multiplexing of multiple point-to-point EVCs across as a single UNI?
- A. EVPL
- B. EMS
- C. EPL
- D. ERMS
Answer: A
Explanation:
Ethernet Relay Service (ERS or EVPL) An Ethernet Virtual Circuit (EVC) is used to logically connect endpoints, but multiple EVCs could exist per single UNI. Each EVC is distinguished by 802.1q VLAN tag identification. The ERS network acts as if the Ethernet frames have crossed a switched network, and certain control traffic is not carried between ends of the EVC. ERS is analogous to Frame Relay where the CE-VLAN tag plays the role of a Data-Link Connection Identifier (DLCI). The MEF term for this service is EVPL.
Reference. http://www.cisco.com/c/en/us/td/docs/net_mgmt/ip_solution_center/51/carrier_ethernet/user/guide/l2vpn51book/concepts.html
NEW QUESTION 31
What is a major difference between Unidirectional Link Detection (UDLD. and Bidirectional Forwarding Detection (BFD.?
- A. UDLD operates at Layer 3 and detects failure of physical links between adjacent routers.
BFD operates at Layer 3 and detects failure of a forwarding path, which may transit multiple Layer 2 hops , between two routers. - B. UDLD operates at Layer 2 and detects failure of physical links. BFD operates at Layer 3 and detects failure of forwarding paths, which may transit multiple Layer2 hops, between two routers.
- C. UDLD operates at Layer 2 and detects failure of physical links BFD operates at Layer 2 and detects failure of a direct link between two routers or switches.
- D. UDLD operates at Layer 3 and detects the failure of the Layer 3 connectivity between two routers. BFD operates at Layer 3 and detects forwarding path failures over multiple Layer 2 hops between two routers.
Answer: B
NEW QUESTION 32
Which two Cisco Express Forwarding tables are located in the data plane? (Choose two.)
- A. the forwarding information base
- B. the label forwarding information base
- C. the IP routing table
- D. the label information table
- E. the adjacency table
Answer: A,E
Explanation:
Explanation/Reference:
Explanation:
References:
NEW QUESTION 33
Which two statements about RTF and RTCP are true? (Choose two)
- A. RTCP supports multiple packet types, including sender reports, receiver reports, and application-specific
packets - B. An RTP session includes TCP port numbers for both RTP and the associated RTCP session
- C. RTCP packets contain application-level information about the RTP source
- D. RTCP provides QoS information about data delivered over RTP
- E. An RTP port is a random even-numbered TCP port between 16,384 and 32,767 and the associated RTCP
port is the sequential odd-numbered port - F. RTCP provides encryption and authentication for RTP flows
Answer: D,E
NEW QUESTION 34
DRAG DROP
Select and Place:
Answer:
Explanation:
NEW QUESTION 35
Refer to the exhibit. Which network script automation option or tool is used in the exhibit?
- A. Python
- B. Bash script
- C. EEP
- D. RESET
- E. NETCONF
Answer: A
NEW QUESTION 36
Which two statements about reverse ARP are true? (Choose two.)
- A. It provides IP addresses for default gateways.
- B. Its servers require static mappings.
- C. It requires less maintenance than DHCP.
- D. It works with AutoInstall to configure new devices.
- E. It provides IP addresses for subnet masks.
Answer: B,D
Explanation:
Explanation/Reference:
NEW QUESTION 37
Which two options are required parts of an EEM policy?(choose two)
- A. Exit status
- B. Event register keyword
- C. Entry status
- D. Body
- E. Namespace import
Answer: B,D
NEW QUESTION 38
Refer to the exhibit.
Router A and B are the edge device at two different sites as shown. The two edge devices use public addresses on their WAN interfaces, and both sites use RFC1918 for all other addresses.if routers A and B have established an IPsec tunnel, which statement about the
network environment must be true?
- A. Router A1 and Router b1 are using NAT translation to allow private-address traffic to traverse the tunnel.
- B. The tunnel terminates on the ISP routers.
- C. Router A and router B are using BGP to share routes between the two sites.
- D. Each site is capable of routing private addressing over the IPsec tunnel.
Answer: D
NEW QUESTION 39
Refer to Exhibit:
Which option describes the meaning of this console message?
- A. An interface has gone down.
- B. An EIGRP process has been shut down.
- C. An EIGRP hold timer has expired.
- D. FastEthernetO/O has interface errors.
Answer: B
NEW QUESTION 40
Refer to the exhibit.
A Cisco Catalyst 6500 Series Switch experiences high CPU utilization. What can be the cause of this issue, and how can it be prevented?
- A. The hardware routing table is full. Reduce the number of routes in the routing table.
- B. The software routing table is full. Reduce the number of routes in the routing table.
- C. The hardware routing table is full. Redistribute from BGP into IGP.
- D. The software routing table is full. Redistribute from BGP into IGP.
Answer: A
Explanation:
Explanation/Reference:
Explanation:
FIB TCAM Exception - If you try to install more routes than are possible into the FIB TCAM you will see the following error message in the logs:
CFIB-SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched
%CFIB-SP-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched. %CFIB- SP-STBY-7-CFIB_EXCEPTION : FIB TCAM exception, Some entries will be software switched.
This error message is received when the amount of available space in the TCAM is exceeded. This results in high CPU. This is a FIB TCAM limitation. Once TCAM is full, a flag will be set and FIB TCAM exception is received. This stops from adding new routes to the TCAM. Therefore, everything will be software switched. The removal of routes does not help resume hardware switching. Once the TCAM enters the exception state, the system must be reloaded to get out of that state. You can view if you have hit a FIB TCAM exception with the following command:
6500-2#sh mls cef exception status
Current IPv4 FIB exception state = TRUE
Current IPv6 FIB exception state = FALSE
Current MPLS FIB exception state = FALSE
When the exception state is TRUE, the FIB TCAM has hit an exception. The maximum routes that can be installed in TCAM is increased by the mls cef maximum-routes command.
Reference. https://supportforums.cisco.com/document/59926/troubleshooting-high-cpu-6500- sup720
NEW QUESTION 41
Which topology allows the split-horizon rule to be safely disabled when using EIGRP?
- A. Partial mesh
- B. Full mesh
- C. Hub and spoke
- D. Ring
Answer: C
NEW QUESTION 42
Which action does route poising take that serves as a loop-prevention method?
- A. It advertises a route with an unreachable metric back onto the interface from which it was learned.
- B. It immediately sends routing updates with an unreachable metric to all devices.
- C. It poisons the route by tagging it uniquely within the network.
- D. It prohibits a router from advertising back onto the interface from which it was learned.
Answer: B
NEW QUESTION 43
Which BGP attribute is used to influence inbound traffic?
- A. Origin
- B. Local preference
- C. Multi-exit discriminator
- D. Weight
Answer: C
NEW QUESTION 44
Which component of a GETVPN deployment Is responsible for obtaining an IPsec SA to encrypt
data within a group?
- A. Group member
- B. GDOI
- C. Key Server
- D. GRE
Answer: B
NEW QUESTION 45
Which IS-IS network type can operate in the absence of a DIS?
- A. point-point
- B. Ethernet
- C. NBMA
- D. point-to-multipoint
Answer: A
NEW QUESTION 46
Which option is the default number of routes over which EIGRP can load balance?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
NEW QUESTION 47
Consider a network that mixes link bandwidths from 128 kb/s to 40 Gb/s. Which value should be set for the OSPF reference bandwidth?
- A. Set a value of 40000.
- B. Use the default value.
- C. Set a value of 128.
- D. Set a manual OSPF cost on each interface.
- E. Set a value of 40000000.
- F. Set a value of 65535.
Answer: D
Explanation:
Unlike the metric in RIP which is determined by hop count and EIGRP's crazy mathematical formulated metric, OSPF is a little more simple. The default formula to calculate the cost for the OSPF metric is (10^8/BW). By default the metrics reference cost is 100Mbps, so any link that is 100Mbps will have a metric of
1. a T1 interface will have a metric of 64 so in this case if a router is trying to get to a FastEthernet network on a router that is through a T1 the metric would be 65 (64 +1). You do however have the ability to statically specify a metric on a per interface basis by using the ip ospf cost # where the cost is an integer between 1-65535. So the big question is why would you want to statically configure a metric? The biggest advantage of statically configuring an OSPF metric on an interface is to manipulate which route will be chosen dynamically via OSPF. In a nut shell it's like statically configuring a dynamic protocol to use a specific route. It should also be used when the interface bandwidths vary greatly (some very low bandwidth interfaces and some very high speed interfaces on the same router).
NEW QUESTION 48
DRAG DROP
Drag and drop the BGP attribute on the left to the correct category on the right.
Answer:
Explanation:
Explanation:
Well Known Mandatory Attribute AS_Path Origin
Well Known Discretionary Attribute Local Preference
Optional Transitive Community
Reference. http://www.deepsh.it/networking/BGP/bgp-attributes.png
NEW QUESTION 49
DRAG DROP
Drag and drop the method for refreshing BGP prefixes on the left to the corresponding description on the right.
Answer:
Explanation:
NEW QUESTION 50
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