CCIE系列认证
单选题Which protocol and port have been assigned by IANA for RADIUS authentication？（）A UDP/1812B UDP/1813C TCP/1812D TCP/1813
题目
UDP/1812
UDP/1813
TCP/1812
TCP/1813
相似问题和答案
第1题：
A. SIP (port 626)
B. TCP (port 646)
C. UDP (port 606)
D. IP (protocol code LDP)
第2题：
Which protocol does the UCS Fabric Interconnect support on port channel uplinks?（）
- A、LACP
- B、PAgP
- C、MCPC
正确答案:A
第3题：
When is a switched network that is running the Spanning Tree Protocol considered to be fully converged?
A．when all switches have the same BID as the root switch
B．when all switches have received the MAC address of each neighboring switch
C．when every enabled switch port has been assigned a unique identifier
D．when every operating switch port is in either the blocking or forwarding state
E．when all switches are in either client, server, or transparent mode
解析：Explanation:
States of the Spanning Tree Protocol:
Blocking A blocked port won't forward frames; it just listens to BPDUs. All ports are in blocking state by default when the switch is powered up. The purpose of the blocking state is to prevent the use of looped paths.
Listening The port listens to BPDUs to make sure no loops occur on the network before passing data frames. A port in listening state prepares to forward data frames without populating the MAC address table.
Learning The switch port listens to BPDUs and learns all the paths in the switched network. A port in learning state populates the MAC address table but doesn't forward data frames.
Forwarding The port sends and receives all data frames on the bridged port.
Disabled A port in the disabled state does not participate in the frame. forwarding or STP. A port in the disabled state is virtually nonoperational. In Blocking States, all ports are in blocking state. The purpose of the blocking state is to prevent the use of looped paths. The forward state sends and receives the all data frames in a loop free network. So these two states are considered to be fully converged.
第4题：
You have been assigned the /24 network and need to segment it into at least 60 subnets.Which network mask meets this requirement?（）
- A、/27
- B、/28
- C、/29
- D、/30
正确答案:D
第5题：
Examine the following options，which Spanning Tree Protocol （STP） protection mechanism disables aswitch port if the port receives a Bridge Protocol Data Unit （BPDU）？（）
- A、Uplink Fast
- B、Port Fast
- C、BPDU Guard
- D、Root Guard
正确答案:C
第6题：
材料：If，by reason of or in compliance with any such directions or recommendations，the vessel does not proceed to the port or ports named in the Bill of Lading or to which she may have been ordered pursuant thereto，the Vessel may proceed to any port as directed or recommended or to any safe port which the Owners in their discretion may decide on and there discharge the cargo．Such discharge shall be deemed to be due fulfillment of the contract of affreightment and the Owners shall be entitled to freight as if discharge had been effected at the port or ports named in the Bill of Lading or to which the Vessel may have been ordered pursuant thereto．
问题：If the vessel does not, under the directions of the Charterer, proceed to the port or ports named in the Bill of Lading or to which she may have been ordered pursuant thereto to, she may proceed to all the following ports except ______ ．
A.any port as directed
B.any port as recommended
C.any safe port which the Owners in their discretion may decide on
D.the port or ports of origin
At the substituted port, the carrier is entitled to ______ freight if he had dilivered full cargo there．A.full freight
B.half freight
C.no freight
D.reasonable freight
The contract of affreightment is referred to ______ ．A.a contract of carriage by which the carrier is entitled to carry certain amount of cargo in a specified time by any vessel or vessels either belonging to himself or to others
B.a contract of carriage, such as Gencon
C.a contract of trade
D.a contract of sales
This is a ______ ．A.a clause of a contract
B.an explanation of a clause in a contract
C.a requirement from a government
D.an article of an international convention
请帮忙给出每个问题的正确答案和分析，谢谢！
问题 2 答案解析：A
问题 3 答案解析：B
问题 4 答案解析：B
第7题：
You have configured a Cisco Catalyst switch to perform Layer 3 routing via an SVI and have assigned that interface to VLAN 20. To check the status of the SVI， you issue the show interfaces vlan 20 command at the CLI prompt. You see from the output display that the interface is in an "up/up" state. What must be true in an SVI configuration to bring the VLAN and line protocol up？（）
- A、The port must be physically connected to another Layer 3 device.
- B、At least one port in VLAN 20 must be active.
- C、The Layer 3 routing protocol must be operational and receiving routing updates from neighboring peer devices.
- D、Because this is a virtual interface， the operational status will always be in an "up/up" state.
正确答案:B
第8题：
A. /27
B. /28
C. /29
D. /30
第9题：
Which protocol below uses TCP port 443?（）
- A、HTML
- B、HTTPS
- C、TFTP
- D、Telnet
- E、SMTP
正确答案:B
第10题：
In an environment in which multiple VLANs have been defined on Catalyst Express 500 switches， which two statements are correct for ports that have been configured with the Smartport role of "IP Phone + Desktop"？（）
- A、The names of the VLANs used by the SmartPorts are case insensitive
- B、The ports may belong to a configurable data VLAN
- C、The names of the VLANs used by the Smartports are not relevant
- D、The ports may belong to many VLANs， depending on how many PCs are connected to each port.
- E、The names of the VLANs used by the Smartports are case sensitive
正确答案:B,E