16 05 2017

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QUESTION 67
A network engineer initiates the ip sla responder tcp-connect command in order to gather statistics for performance gauging. Which type of statistics does the engineer see?

A.    connectionless-oriented
B.    service-oriented
C.    connection-oriented
D.    application-oriented

Answer: C
Explanation:
Configuration Examples for IP SLAs TCP Connect Operations The following example shows how to configure a TCP Connection-oriented operation from Device B to the Telnet port (TCP port 23) of IP Host 1 (IP address 10.0.0.1), as shown in the “TCP Connect Operation” figure in the “Information About the IP SLAs TCP Connect Operation” section. The operation is scheduled to start immediately. In this example, the control protocol is disabled on the source (Device B). IP SLAs uses the control protocol to notify the IP SLAs responder to enable the target port temporarily. This action allows the responder to reply to the TCP Connect operation. In this example, because the target is not a Cisco device and a well-known TCP port is used, there is no need to send the control message.
Device A (target device) Configuration
configure terminal
ip sla responder tcp-connect ipaddress 10.0.0.1 port 23
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipsla/configuration/15-mt/sla-15-mt-book/sla_tcp_conn.html

QUESTION 68
A network engineer executes the ipv6 flowset command. What is the result?

A.    Flow-label marking in 1280-byte or larger packets is enabled.
B.    Flow-set marking in 1280-byte or larger packets is enabled.
C.    IPv6 PMTU is enabled on the router.
D.    IPv6 flow control is enabled on the router.

Answer: A
Explanation:
Enabling Flow-Label Marking in Packets that Originate from the Device This feature allows the device to track destinations to which the device has sent packets that are 1280 bytes or larger.
http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipv6_basic/configuration/15-mt/ip6b-15-mt-book/ip6-mtu-path-disc.html

QUESTION 69
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

Answer: A
Explanation:
http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/oaggnf.html

QUESTION 70
A network engineer is asked to configure a “site-to-site” IPsec VPN tunnel. One of the last things that the engineer does is to configure an access list (access-list 1 permit any) along with the command ip nat inside source list 1 int s0/0 overload. Which functions do the two commands serve in this scenario?

A.    The command access-list 1 defines interesting traffic that is allowed through the tunnel.
B.    The command ip nat inside source list 1 int s0/0 overload disables “many-to-one” access for all devices on a defined segment to share a single IP address upon exiting the external interface.
C.    The command access-list 1 permit any defines only one machine that is allowed through the tunnel.
D.    The command ip nat inside source list 1 int s0/0 overload provides “many-to-one” access for all devices on a defined segment to share a single IP address upon exiting the external interface.

Answer: D
Explanation:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094e77.shtml

QUESTION 71
A network administrator executes the command clear ip route. Which two tables does this command clear and rebuild? (Choose two.)

A.    IP routing
B.    FIB
C.    ARP cache
D.    MAC address table
E.    Cisco Express Forwarding table
F.    topology table

Answer: AB

QUESTION 72
Which switching method is used when entries are present in the output of the command show ip cache?

A.    fast switching
B.    process switching
C.    Cisco Express Forwarding switching
D.    cut-through packet switching

Answer: A
Explanation:
Fast switching allows higher throughput by switching a packet using a cache created by the initial packet sent to a particular destination. Destination addresses are stored in the high-speed cache to expedite forwarding. Routers offer better packet-transfer performance when fast switching is
enabled. Fast switching is enabled by default on all interfaces that support fast switching. To display the routing table cache used to fast switch IP traffic, use the “show ip cache” EXEC command.
http://www.cisco.com/c/en/us/td/docs/ios/12_2/switch/command/reference/fswtch_r/xrfscmd5.html #wp1038133

QUESTION 73
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.

Answer: AB
Explanation:
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 Networks (LFNs). 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. http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/ipapp/configuration/12-4t/iap-12-4t-book/iap-tcp.html#GUID-BD998AC6-F128-47DD-B5F7-B226546D4B08

QUESTION 74
Which PPP authentication method sends authentication information in cleartext?

A.    MS CHAP
B.    CDPCP
C.    CHAP
D.    PAP

Answer: D
Explanation:
PAP authentication involves a two-way handshake where the username and password are sent across the link in clear text; hence, PAP authentication does not provide any protection against playback and line sniffing.
CHAP authentication, on the other hand, periodically verifies the identity of the remote node using a three-way handshake. After the PPP link is established, the host sends a “challenge” message to the remote node. The remote node responds with a value calc”lated usi”g a one-way hash function. The host checks the response against its own calculation of the expected hash value. If the values match, the authentication is acknowledged; otherwise, the connection is terminated.
http://www.cisco.com/c/en/us/support/docs/wan/point-to-point-protocol-ppp/10241-ppp-callin-hostname.html

QUESTION 75
Which protocol uses dynamic address mapping to request the next-hop protocol address for a specific connection?

A.    Frame Relay inverse ARP
B.    static DLCI mapping
C.    Frame Relay broadcast queue
D.    dynamic DLCI mapping

Answer: A
Explanation:
Dynamic address mapping uses Frame Relay Inverse ARP to request the next-hop protocol address for a specific connection, given its known DLCI. Responses to Inverse ARP requests are entered in an address-to-DLCI mapping table on the router or access server; the table is then used to supply the next-hop protocol address or the DLCI for outgoing traffic.
http://www.cisco.com/c/en/us/td/docs/ios/12_2/wan/configuration/guide/fwan_c/wcffrely.html

QUESTION 76
What is the default OSPF hello interval on a Frame Relay point-to-point network?

A.    10
B.    20
C.    30
D.    40

Answer: A
Explanation:
Before you troubleshoot any OSPF neighbor-related issues on an NBMA network, it is important to remember that an NBMA network can be configured in these modes of operation with the ip ospf network command:
The Hello and Dead Intervals of each mode are described in this table:
Network Type
Hello Interval (secs)
Dead Interval (secs)
Point-to-Point
Point-to-Multipoint
Broadcast
Non-Broadcast
http://www.cisco.com/c/en/us/support/docs/ip/open-shortest-path-first-ospf/13693-22.html

QUESTION 77
A router with an interface that is configured with ipv6 address autoconfig also has a link- local address assigned. Which message is required to obtain a global unicast address when a router is present?

A.    DHCPv6 request
B.    router-advertisement
C.    neighbor-solicitation
D.    redirect

Answer: B
Explanation:
Autoconfiguration is performed on multicast-enabled links only and begins when a multicast- enabled interface is enabled (during system startup or manually). Nodes (both, hosts and routers) begin the process by generating a link-local address for the interface. It is formed by appending the interface identifier to well-known link-local prefix FE80::0. The interface identifier replaces the right-most zeroes of the link-local prefix.Before the link-local address can be assigned to the interface, the node performs the Duplicate Address Detection mechanism to see if any other node is using the same link-local address on the link. It does this by sending a Neighbor Solicitation message with target address as the “tentative” address and destination address as the solicited- node multicast address corresponding to this tentative address. If a node responds with a Neighbor Advertisement message with tentative address as the target address, the address is a duplicate address and must not be used. Hence, manual configuration is required. Once the node verifies that its tentative address is unique on the link, it assigns that link-local address to the interface. At this stage, it has IP-connectivity to other neighbors on this link. The autoconfiguration on the routers stop at this stage, further tasks are performed only by the hosts. The routers will need manual configuration (or stateful configuration) to receive site-local or global addresses.
The next phase involves obtaining Router Advertisements from routers if any routers are present on the link. If no routers are present, a stateful configuration is required. If routers are present, the Router Advertisements notify what sort of configurations the hosts need to do and the hosts receive a global unicast IPv6 address.
https://sites.google.com/site/amitsciscozone/home/important-tips/ipv6/ipv6-stateless-autoconfiguration

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