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2013 Latest Cisco 350-001 Exam Section 2: Services (8 Questions)

QUESTION NO: 1
A diskless workstation boots up and uses BOOTP to obtain the information it needs from a BOOTP server. How will the diskless client obtain the information it needs from the server?
A. The BootP client will use a telnet application to connect to the server, after which the client will use the DHCP server to get hold of the memory image.
B. The BootP client will obtain the memory image after which the client will use a second protocol to gather the necessary information.
C. The BootP client will use a second protocol to gather the necessary information, and then the BootP server will send memory image.
D. The BootP server will gather and provide the client with the information necessary to obtain an image and then the client will use a second protocol to obtain the memory image.
E. None of above.
Answer: D
Explanation:
This RFC describes an IP/UDP bootstrap protocol (BOOTP), which allows a diskless client machine to discover its own IP address, the address of a server host, and the name of a file to be loaded into memory and executed. The bootstrap operation can be thought of as consisting of TWO PHASES. This RFC describes the first phase, which could be labeled `address determination and boot file selection’. After this address and filename information is obtained, control passes to the second phase of the bootstrap where a file transfer occurs. The file transfer will typically use the TFTP protocol, since it is intended that both phases reside in PROM on the client. However BOOTP could also work with other protocols such as SFTP or FTP. This RFC suggests a proposed protocol for the ARPA-Internet community, and requests discussion and suggestions for improvements. BOOTP procedure summary. Diskless workstation broadcasts a bootp request on port 67. Server responds to this request on port 68. Server provides the client with two pieces information. 1.IP address of client and Hostname of the Server. 2.File name required by client to boot. The Client then uses TFTP to obtain this file from the Server and boot. Incorrect Answers:
A. Telnet is not used.
B. The memory image is the last step, not the first.
C. The client must first receive some basic information before using a second protocol, such as TFTP.

QUESTION NO: 2
You want to ensure that Host A has connectivity with Host B. Host A and Host B are connected via Router TK1 and Router TK2. A has an 8 bit network mask while Host B has a 24 bit network mask. The TestKing network is shown in the following exhibit. No routing protocols or static routes are configured on either TK1 or TK2.
Which of the following is required to enable Host A to send packets to Host B?
A. Host A must have a default gateway address of 10.1.1.1.
B. Host B must have a default gateway address of 10.1.3.1.
C. Proxy ARP must be enabled on Router TK1.
D. Proxy ARP must be enabled on Router TK2.
E. Host A will not be able to reach host B until routing is enabled in this network.
Answer: B, C
Explanation:
The default gateway for any host must reside on the same subnet as that host so Host B must have its default gateway set to TK2. In order for packets to reach host B, then host A must have its default gateway set to TK2 also. This will only work if proxy ARP is enabled on TK1. This is because Host A will assume that Host B is on the same network statement, because its subnet mask is /8. It will therefore ARP to reach Host B. Because of this, TK1 must have proxy ARP enabled to pass the request on to Host B. For the return traffic, Host B must use a default gateway, because for it to reach Host A a default gateway must be used since it is on a different network segment.
Incorrect Answers:
A. If host A sets its default gateway to TK1, then it will not be able to send traffic to host B, since no routing exists. All hosts must have a default gateway that resides on the same LAN subnet.
D. Proxy ARP needs to be enabled on TK1, not TK2, to pass the traffic to host B.

QUESTION NO: 3
Which of the following DNS resource records are valid? (Choose all that apply)
A. NS
B. PTR
C. MX
D. FQDN
E. A
F. None of the above
Answer: A, B, C, E
Explanation:
NS (Name Service), PTR (Pointer), MX (Mail Exchange), and A records are all DNS resource record types.
Incorrect Answers: D
FQDN is Fully Qualified Domain name, for example, www.cisco.com. It has nothing do with DNS Resource Records.

QUESTION NO: 4
Your network is shown in the following exhibit: You want all PC’s at TK1 to be able to obtain their IP address dynamically from the DHCP server that resides at TK2. Currently, the hosts are not able to obtain an IP address, and they are receiving error messages saying that the DHCP server is busy or is unavailable. What must be done to enable these PC’s to obtain dynamic IP addresses.
A. Enable the command “ip helper-address 10.1.1.100” under the S0 interface on Router TK1.
B. Enable the command “ip helper-address 10.1.1.100” under the E0 interface on Router TK1.
C. Enable the command “ip helper-address 255.255.255.255” under the E0 interface on Router TK1.
D. Enable the command “ip helper-address 255.255.255.255” under the S0 interface on Router TK2.
E. Enable the command “ip helper-address 10.1.1.100” in global configuration mode on router TK1.
F. Enable the command “ip helper-address 10.1.1.100” in global configuration mode on router TK2.
Answer: B
Explanation:
By default, routers drop all broadcast packets sent through them. Because DHCP clients use BOOTP packets, which are broadcasted to all hosts (255.255.255.255), they will be dropped by router TK1. The “ip helper-address” command enables the router to forward these BOOTP broadcast packets to a specific host, as specified by the address following the “ip helper-address” command. Note that this command must be placed on the router’s interface that is receiving the broadcast packets from the hosts, which is E0 of the TK1 router.

QUESTION NO: 5
Use the following network diagram for reference:

There is a GRE tunnel between two routers, TK1 and TK2. Small files can be sent and received through this tunnel, but large files can not. In addition to this, many web pages are not able to be seen.
On TK1, you issue the “debug ip icmp” command and try to ping the server with IP address 10.1.1.1 and see the following:
ICMP: dst (10.10.10.10) frag. needed and DF set unreachable sent to

10.1.1.1

How can this problem be solved? (Choose all that apply.)
A. Ensure that no filters exist between the tunnel endpoints blocking ICMP.
B. Increase the IP MTU on the tunnel interfaces to 1500.
C. Enable “ip unreachables” on all interfaces on Router TK2.
D. Decrease the physical interface MTU on the serial interfaces of TK1 and TK2 to less than 1476 bytes.
E. If the physical link between Router TK1 and Router TK2 is able to support a MTU size greater than 1524 bytes, then increase the interface MTU between the tunnel end points to match 1524.
Answer: A, E
Reference:
Refer to “Why Can’t I Browse the Internet when Using a GRE Tunnel?”
http://www.cisco.com/warp/public/105/56.html

QUESTION NO 6:
Select the mode that NTP servers can associate with each other:

A. Client and Server
B. Peer
C. Broadcast/Multicast
D. B and C
E. All the above
Answer: B
Explanation:
NTP synchronizes timekeeping among a set of distributed time servers and clients. This synchronization allows events to be correlated when system logs are created and other time-specific events occur. An NTP association can be a peer association (meaning that this system is willing to either synchronize to the other system or to allow the other system to synchronize to it), or it can be a server association (meaning that only this system will synchronize to the other system, and not the other way around). An NTP server can only be configured as a peer to another NTP server.

QUESTION NO 7: A customer wants to install a new frame-relay router in their network. One goal is to ensure that the new router has the correct configuration to maintain a consistent time and date, like the other routers in the network. The customer wants to configure the new router to periodically poll a UNIX server that has a very reliable and stable clock for the correct time. This will synchronize the new router’s clock with the UNIX server. What command should be configured on the new router to synchronize its clock with a centralized clock service?
A. ntp master
B. ntp server
C. ip ntp clock
D. ntp peer
E. sntp master
F. All of the above
Answer: B
Explanation:
To allow the system clock to be synchronized by a time server, use the ntp server global configuration command.
Incorrect Answers:
A. This command will configure the router to act as the NTP master server, providing time information to other devices.
C. This is an invalid command.
D. Use this command if you want to allow the router to synchronize with an NTP peer, or vice versa.
E. SNTP is a simpler version of NTP used by lower end Cisco devices. If SNTP were to be used, the correct syntax would be “sntp server” and not “sntp master.”

QUESTION NO: 8 What should be configured on redundant routers to support the need for a default gateway on LAN network hosts when there are two gateway routers providing connectivity to the rest of the network?
A. DHCP
B. RIP
C. OSPF
D. HSRP
E. BOOTP
Answer: D
Explanation:
The Hot Standby Router Protocol (HSRP) provides network redundancy for IP networks, ensuring that user traffic immediately and transparently recovers from default gateway failures in the network. It is implemented on networks where there are two or more gateway routers that provide connectivity to the rest of the network with the standby router acting as an automatic failover should the primary router fail.
Incorrect Answers:
A, E: DHCP and BOOTP are used to provide IP addressing, DNS, and default gateway
information to end user hosts.
B, C: RIP and OSPF are routing protocols, and will not provide for automatic default
gateway redundancy for PC hosts.

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