思科认证640-802模拟试卷2

Which of the following can lead to the contribution of LAN traffic congestion?(Select all that apply)

A. Too many hosts in a broadcast domain

B. Full duplex operation

C. Broadcast storms

D. Multicasting

E. Segmentation

F. Low bandwidth

ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets? (Choose two)

A. They acknowledge receipt of TCP segments.

B. They guarantee datagram delivery.

C. They can provide hosts with information about network problems.

D. They are encapsulated within IP datagrams.

E. They are encapsulated within UDP datagrams.

F. They are encapsulated within TCP datagrams.

Router VE1 has just received a packet and needs to route it. What two actions must this router take in order to route incoming packets? (Choose two)

A. Inspect the routing table to select the best path to the destination network addresses.

B. Validate sources of routing information.

C. Inspect the ARP table to verify a legitimate source MAC address for each packet.

D. Identify the destination network address of each packet.

E. Verify the receipt of routed packets by the next hop router.

F. Identify the source network address of each packet.

RIP version 2 is being used as the routing protocol within the Ezonexam network.

What does RIP version 2 use to prevent routing loops? (Choose two)

A. CIDR

B. Split horizon

C. Authentication

D. Classless masking

E. Hold-down timers

F. Multicast routing updates

G. Path Vectoring

Which of the protocols below use TCP at the transport layer? (Select four)

A. TFTP

B. SMTP

C. SNMP

D. FTP

E. HTTP

F. HTTPS

Ezonexam is installing IP phones in a new office. The phones and office computers connect to the same device. To ensure maximum throughout for the phone data sessions, the company needs to make sure that the phone traffic is on a different network from that of the office computer data traffic. What is the best network device to which to directly connect the phones and computers and what technology should be implemented on this device? (Choose two)

A. VLAN

B. Subinterface

C. STP

D. Hub

E. Switch

F. Router

G. Wireless Access Point

H. VTP

As a network administrator, you will need to decide on the appropriate network devices to use. Which of the following correctly describes the roles of devices in a WAN? (Choose three)

A. A CSU/DSU terminates a digital local loop.

B. A router is commonly considered a DCE device.

C. A modem terminates an analog local loop.

D. A router is commonly considered a DTE device.

E. A modem terminates a digital local loop.

F. A CSU/DSU terminates an analog local loop.

G. A modem is used to terminate a T1

As a CCNA candidate, you must know the various layers of the OSI model. At which layers of the OSI Model do Wide Area Networks operate in? (Choose two)

A. Physical Layer

B. Datalink Layer

C. Network Layer

D. Session Layer

E. Transport Layer

F. Presentation Layer

G. Application Layer

After making some network changes you power off and then power on your Cisco router named VE1. What sequence of events occurs when VE1 is powered up?

A. Perform. POST, locate configuration statements, apply configuration statements, locate Cisco IOS software, and load Cisco IOS software.

B. Locate Cisco IOS software, load Cisco IOS software, locate configuration statements, apply configuration statements, and perform. POST.

C. Test software routines, POST, load configuration files, load Cisco IOS software, test Cisco IOS software.

D. Perrform. POST, locate Cisco IOS software, load the Cisco IOS software, locate configuration statements, and apply configuration statements.

E. Load and test IOS, load configuration files, test software routines, POST.

F. None of the above

Which three statements are true about the operation of a full-duplex Ethernet network, which is being used in the Ezonexam LAN? (Choose three)

VE1 is a switch in the Ezonexam network. Why will VE1 never learn the broadcast address?

A. Broadcast frames are never sent to switches

B. A broadcast frame. is never forwarded by a switch

C. Broadcasts only use network layer addressing

D. A broadcast address will never be the source address of a frame

E. Broadcast addresses use an incorrect format for the switching table

F. None of the above

Which layer of the OSI reference model is responsible for ensuring reliable end-to-end delivery of data?

A. Application

B. Presentation

C. Session

D. Transport

E. Network

F. Data-Link

In a Ezonexam network that supports VLSM, which network mask should be used for point-to-point WAN links in order to reduce waste of IP addresses?

A. /24

B. /30

C. /27

D. /26

E. /32

F. None of the above

Acknowledgements, sequencing, and flow control are functions that are handled by which layer of the OSI model?

A. Layer 5

B. Layer 4

C. Layer 7

D. Layer 6

E. Layer 3

F. Layer 2

G. Layer 1

At which OSI layer is a logical path created between two host systems named VE1 and VE2 on the Ezonexam LAN?

A. Physical

B. Session

C. Data link

D. Transport

E. Network

F. Application

G. Presentation

Ezonexam users have noticed extremely slow network performance, intermittent connectivity, and connection losses. After entering the "show interfaces" command, you notice that the Ethernet interface is configured as 100 Mbps full-duplex and that there is evidence of late collisions. What could be the cause of this problem?

A. Duplex mismatch

B. A routing loop

C. Trunking mode mismatch

D. Improperly configured root bridge

E. Improperly configured static VLAN

F. None of the above

The Ezonexam LAN is upgrading all devices to operate in full duplex. Which statement is true about full-duplex Ethernet in comparison to half-duplex Ethernet?

From where does a small network typically get its IP network addresses or IP block?