Foolproof cisco 400 101 tips

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Q101. A TCP/IP host is able to transmit small amounts of data (typically less than 1500 bytes), but attempts to transmit larger amounts of data hang and then time out. What is the cause of this problem? 

A. A link is flapping between two intermediate devices. 

B. The processor of an intermediate router is averaging 90 percent utilization. 

C. A port on the switch that is connected to the TCP/IP host is duplicating traffic and sending it to a port that has a sniffer attached. 

D. There is a PMTUD failure in the network path. 

Answer:

Explanation: 

Sometimes, over some IP paths, a TCP/IP node can send small amounts of data (typically less than 1500 bytes) with no difficulty, but transmission attempts with larger amounts of data hang, then time out. Often this is observed as a unidirectional problem in that large data transfers succeed in one direction but fail in the other direction. This problem is likely caused by the TCP MSS value, PMTUD failure, different LAN media types, or defective links. 

Reference: http://www.cisco.com/c/en/us/support/docs/additional-legacy-protocols/ms-windows-networking/13709-38.html 


Q102. Which three statements are true about OSPFv3? (Choose three.) 

A. The only method to enable OSPFv3 on an interface is via the interface configuration mode. 

B. Multiple instances of OSPFv3 can be enabled on a single link. 

C. There are two methods to enable OSPFv3 on an interface, either via the interface configuration mode or via the router configuration mode. 

D. For OSPFv3 to function, IPv6 unicast routing must be enabled. 

E. For OSPFv3 to function, IPv6 must be enabled on the interface. 

F. Only one instance of OSPFv3 can be enabled on a single link. 

Answer: B,D,E 

Explanation: 

Here is a list of the differences between OSPFv2 and OSPFv3: 

They use different address families (OSPFv2 is for IPv4-only, OSPFv3 can be used for IPv6-only or both protocols (more on this following)) 

OSPFv3 introduces new LSA types 

OSPFv3 has different packet format 

OSPFv3 uses different flooding scope bits (U/S2/S1) 

OSPFv3 adjacencies are formed over link-local IPv6 communications 

OSPFv3 runs per-link rather than per-subnet 

OSPFv3 supports multiple instances on a single link, Interfaces can have multiple IPv6 addresses 

OSPFv3 uses multicast addresses FF02::5 (all OSPF routers), FF02::6 (all OSPF DRs) 

OSPFv3 Neighbor Authentication done with IPsec (AH) 

OSPFv2 Router ID (RID) must be manually configured, still a 32-bit number 

Following is a simple example of OSPFv3 configuration on a Cisco IOS 12.4T router. 

ipv6 unicast-routing 

ipv6 cef 

interface GigabitEthernet 0/0 

description Area 0.0.0.0 backbone interface 

ipv6 address 2001:DB8:100:1::1/64 

ipv6 ospf network broadcast 

ipv6 ospf 100 area 0.0.0.0 

Reference: http://www.networkworld.com/article/2225270/cisco-subnet/ospfv3-for-ipv4-and-ipv6.html 


Q103. DRAG DROP 

Drag and drop the BGP attribute on the left to the correct category on the right. 

Answer: 


Q104. Which two statements about packet fragmentation on an IPv6 network are true? (Choose two.) 

A. The fragment header is 64 bits long. 

B. The identification field is 32 bits long. 

C. The fragment header is 32 bits long. 

D. The identification field is 64 bits long. 

E. The MTU must be a minimum of 1280 bytes. 

F. The fragment header is 48 bits long. 

Answer: A,B 

Explanation: 

The fragment header is shown below, being 64 bits total with a 32 bit identification field: 

Reference: http://www.openwall.com/presentations/IPv6/img24.html 


Q105. DRAG DROP 

Drag each MPLS term on the left to the matching statement on the right. 

Answer: 


Q106. Which two metrics are measured with active probes when PfR voice traffic optimization is in use? (Choose two.) 

A. MOS 

B. cost 

C. jitter 

D. bandwidth 

Answer: A,C 


Q107. You are configuring Wireshark on a Cisco Catalyst 4500E Switch with a Supervisor 8. Which three actions can you take to prevent the capture from overloading the CPU? (Choose three.) 

A. Attach the specific ports that are part of the data path. 

B. Use an in-line filter. 

C. Use an appropriate ACL. 

D. Add memory to the Supervisor. 

E. Reconfigure the buffers to accommodate the additional traffic. 

F. Configure a policy map, class map, and an access list to express the match conditions. 

Answer: A,B,C 

Explanation: 

Because packet forwarding typically occurs in hardware, packets are not copied to the CPU for software processing. For Wireshark packet capture, packets are copied and delivered to the CPU, which causes an increase in CPU usage. To avoid high CPU, do the following: 

. Attach only relevant ports. 

. Use a class map, and secondarily, an access list to express match conditions. If neither is viable, use an explicit, in-line filter. 

. Adhere closely to the filter rules. Restrict the traffic type (such as, IPv4 only) with a restrictive, rather than relaxed ACL, which elicits unwanted traffic. 

Reference: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst4500/15-1-2/XE_340/configuration/guide/config/wireshrk.pdf 


Q108. DRAG DROP 

Drag each GETVPN component on the left to its function on the right. 

Answer: 


Q109. Refer to the exhibit. 

R1 is configured as shown. R1 is able to establish a neighbor adjacency only with R2. Which addition must you make to the R1 configuration to allow it to establish an adjacency with R3? 

A. interface gigabitethernet 0/1 

ip address 10.1.0.1 255.255.255.0 

ip ospf network point-to-point 

B. interface gigabitethernet 0/1 

ip address 10.1.0.1 255.255.255.0 

ip ospf 1 area 0 

C. router ospf 1 

network 10.1.0.0 0.0.0.255 area 1 

D. router ospf 1 

area 0 stub 

Answer:

Explanation: 

To enable interfaces and networks with OSPF, the networks need to be specified in the network statement. In the configuration shown, only 10.0.0.0/24 has been enabled, we are missing the network connecting to R3 (10.1.0.0/24). 


Q110. Which three options are components of an EEM CLI policy? (Choose three.) 

A. Safe-Tcl 

B. applet name 

C. Fast Tcl 

D. event 

E. action 

F. Tcl bytecode 

Answer: B,D,E 

Explanation: 

The Embedded Event Manager (EEM) monitors events that occur on your device and takes action to recover or troubleshoot these events, based on your configuration. 

EEM consists of three major components: 

Event statements — Events to monitor from another Cisco NX-OS component that might require some action, workaround, or notification. 

Action statements — An action that EEM can take, such as sending an e-mail, or disabling an interface, to recover from an event. 

Policies — An applet name paired with one or more actions to troubleshoot or recover from the event. 

Reference: 

http://www.cisco.com/c/en/us/td/docs/switches/datacenter/nexus5500/sw/system_manage ment/6x/b_5500_System_Mgmt_Config_6x/b_5500_System_Mgmt_Config_6x_chapter_01 0011.html 


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