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Q31. A network engineer executes the show ip flow export command. Which line in the output indicates that the send queue is full and export packets are not being sent?
A. output drops
B. enqueuing for the RP
C. fragmentation failures
D. adjacency issues
Table 5 show ip flow export Field Descriptions Field Description Exporting flows to 10.1.1.1
Specifies the export destinations and ports. (1000) and 10.2.1.1 The ports are in parentheses. Exporting
using source Specifies the source address or interface. IP address 10.3.1.1 Version 5 flow records
Specifies the version of the flow. 11 flows exported in 8 udp The total number of export packets sent, and
datagrams the total number of flows contained within them. 0 flows failed due to lack of No memory was
available to create an export export packet packet. 0 export packets were sent The packet could not be
processed by CEF or up to process level by fast switching, possibly because another feature requires
running on the packet. 0 export packets were Indicates that CEF was unable to switch the dropped due to
no fib packet or forward it up to the process level. 0 export packets were dropped due to adjacency issues
0 export packets were Indicates that the packet was dropped because dropped due to of problems
constructing the IP packet. fragmentation failures 0 export packets were dropped due to encapsulation
fixup failures 0 export packets were Indicates that there was a problem transferring dropped enqueuing for
the the export packet between the RP and the line RP card. 0 export packets were dropped due to IPC
rate limiting 0 export packets were Indicates that the send queue was full while dropped due to output the
packet was being transmitted. drops
Q32. Refer to the exhibit. The command is executed while configuring a point-to-multipoint Frame Relay interface. Which type of IPv6 address is portrayed in the exhibit?
Q33. Which encapsulation supports an interface that is configured for an EVN trunk?
D. Frame Relay
Restrictions for EVN
An EVN trunk is allowed on any interface that supports 802.1q encapsulation, such as Fast Ethernet,
Gigabit Ethernet, and port channels.
A single IP infrastructure can be virtualized to provide up to 32 virtual networks end-to-end.
If an EVN trunk is configured on an interface, you cannot configure VRF-Lite on the same interface.
OSPFv3 is not supported; OSPFv2 is supported.
Q34. Which type of traffic does DHCP snooping drop?
A. discover messages
B. DHCP messages where the source MAC and client MAC do not match
C. traffic from a trusted DHCP server to client
D. DHCP messages where the destination MAC and client MAC do not match
The switch validates DHCP packets received on the untrusted interfaces of VLANs with DHCP snooping
enabled. The switch forwards the DHCP packet unless any of the following conditions occur (in which case the packet is dropped):
The switch receives a packet (such as a DHCPOFFER, DHCPACK, DHCPNAK, or DHCPLEASEQUERY
packet) from a DHCP server outside the network or firewall.
The switch receives a packet on an untrusted interface, and the source MAC address and the DHCP client
hardware address do not match. This check is performed only if the DHCP snooping MAC address
verification option is turned on. · The switch receives a DHCPRELEASE or DHCPDECLINE message from an untrusted host with an entry in the DHCP snooping binding table, and the interface information in the binding table does not match the interface on which the message was received.
The switch receives a DHCP packet that includes a relay agent IP address that is not 0.0.0.0. To support
trusted edge switches that are connected to untrusted aggregation-switch ports, you can enable the DHCP
option-82 on untrusted port feature, which enables untrusted aggregation- switch ports to accept DHCP
packets that include option-82 information. Configure the port on the edge switch that connects to the
aggregation switch as a trusted port. Reference: http:// www.cisco.com/c/en/us/td/docs/switches/lan/
Topic 7, Mix Questions
83. Which two commands would be used to troubleshoot high memory usage for a process? (Choose two.)
A. router#show memory allocating-process table
B. router#show memory summary
C. router#show memory dead
D. router#show memory events
E. router#show memory processor statistics
Q35. How does an IOS router process a packet that should be switched by Cisco Express Forwarding without an FIB entry?
A. by forwarding the packet
B. by dropping the packet
C. by creating a new FIB entry for the packet
D. by looking in the routing table for an alternate FIB entry
Down to date 300-101 practice:
Q36. The enterprise network WAN link has been receiving several denial of service attacks from both IPv4 and IPv6 sources. Which three elements can you use to identify an IPv6 packet via its header, in order to filter future attacks? (Choose three.)
A. Traffic Class
B. Source address
C. Flow Label
D. Hop Limit
E. Destination Address
F. Fragment Offset
Q37. For troubleshooting purposes, which method can you use in combination with the “debug ip packet” command to limit the amount of output data?
A. You can disable the IP route cache globally.
B. You can use the KRON scheduler.
C. You can use an extended access list.
D. You can use an IOS parser.
E. You can use the RITE traffic exporter.
The debug ip packet command generates a substantial amount of output and uses a substantial amount of
system resources. This command should be used with caution in production networks. Always use with the access-list command to apply an extended ACL to the debug output. Reference: http://www.cisco.com/c/en/us/support/docs/security/dynamic-multipoint-vpn-dmvpn/111976-dmvpn-troubleshoot-00.html
Q38. Refer to the exhibit. The DHCP client is unable to receive a DHCP address from the DHCP server. Consider the following output:
hostname RouterB ! interface fastethernet 0/0
ip address 172.31.1.1 255.255.255.0 interface serial 0/0 ip address 10.1.1.1 255.255.255.252
! ip route 172.16.1.0 255.255.255.0 10.1.1.2
Which configuration is required on the Router B fastethernet 0/0 port in order to allow the DHCP client to successfully receive an IP address from the DHCP server?
A. RouterB(config-if)# ip helper-address 172.16.1.2
B. RouterB(config-if)# ip helper-address 172.16.1.1
C. RouterB(config-if)# ip helper-address 172.31.1.1
D. RouterB(config-if)# ip helper-address 255.255.255.255
Q39. What does the following access list, which is applied on the external interface FastEthernet 1/0 of the perimeter router, accomplish?
router(config)#access-list 101 deny ip 10.0.0.0 0.255.255.255 any log
router (config)#access-list 101 deny ip 192.168.0.0 0.0.255.255 any log
router (config)#access-list 101 deny ip 172.16.0.0 0.15.255.255 any log
router (config)#access-list 101 permit ip any any
router (config)#interface fastEthernet 1/0
router (config-if)#ip access-group 101 in
A. It prevents incoming traffic from IP address ranges 10.0.0.0-10.0.0.255, 172.16.0.0-172.31.255.255, 192.168.0.0-192.168.255.255 and logs any intrusion attempts.
B. It prevents the internal network from being used in spoofed denial of service attacks and logs any exit to the Internet.
C. It filters incoming traffic from private addresses in order to prevent spoofing and logs any intrusion attempts.
D. It prevents private internal addresses to be accessed directly from outside.
The private IP address ranges defined in RFC 1918 are as follows:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
These IP addresses should never be allowed from external networks into a
corporate network as they would only be able to reach the network from the outside via routing problems or
if the IP addresses were spoofed. This ACL is used to prevent all packets with a spoofed reserved private
source IP address to enter the network. The log keyword also enables logging of this intrusion attempt.
Q40. Which two actions must you perform to enable and use window scaling on a router? (Choose two.)
A. Execute the command ip tcp window-size 65536.
B. Set window scaling to be used on the remote host.
C. Execute the command ip tcp queuemax.
D. Set TCP options to "enabled" on the remote host.
E. Execute the command ip tcp adjust-mss.
The TCP Window Scaling feature adds support for the Window Scaling option in RFC 1323,
TCP Extensions for High Performance . A larger window size is recommended to improve TCP performance in network paths with large bandwidth-delay product characteristics that are called Long Fat
The TCP Window Scaling enhancement provides that support. The window scaling extension in Cisco IOS software expands the definition of the TCP window to 32 bits and then uses a scale factor to carry this 32-bit value in the 16-bit window field of the TCP header.
The window size can increase to a scale factor of 14. Typical applications use a scale factor of 3 when deployed in LFNs.
The TCP Window Scaling feature complies with RFC 1323. The larger scalable window size will allow TCP to perform better over LFNs.
Use the ip tcp window-size command in global configuration mode to configure the TCP window size. In order for this to work, the remote host must also support this feature and its window size must be increased.