CCIE系列认证综合练习真题精选.docx
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CCIE系列认证综合练习真题精选
CCIE系列认证综合练习真题精选
[填空题]
1dhcp是基于什么协议的？
参考答案：
DHCP is based on the Bootstrap Protocol （BOOTP）.It also base on UDP， using UDP port 67 and 68.
[填空题]
2what does DHCP binding mean？
参考答案：
DHCP binding is a mapping between the client’s IP address and client’s hardware addresses on DHCP server.
[填空题]
3当multicast启用pim sparse-mode，但是没配置auto-rp，你将用什么方法？
参考答案：
use static RP or BSR to configure.
[填空题]
4CGMP的purpose？
参考答案：
CGMP is using to reduce unnecessary multicast traffic on layer2 switch.
dynamically configure Cisco Catalyst switch ports so that IP multicast traffic is forwarded only to those ports associated with IP multicast hosts.
[填空题]
5CLASS-MAP match-all XXX 其中match-all表示什么意思？
参考答案：
The traffic being evaluated by the traffic class must match all of the specified.
Match-any：
The traffic being evaluated by the traffic class must match at least one of the specified criteria.
[单项选择题]
6、On the basis of the definitions of different services in various RFCs，traffic with Expedited Forwarding per-hop behavior should be marked as which of these？
（）
A.IP ToS of 0xEF
B.IP experimental ECN
C.DSCP decimal 5
D.Binary value of 101110
参考答案：
D
[单项选择题]
7、A user has no network connectivity. A check of the associated port indicates that the interface is up，the line protocol is down. Which item would most likely cause this problem？
（）
A.Speed mismatch
B.Incorrect encapsulation
C.MTU set too low
D.Duplex mismatch
参考答案：
A
[填空题]
8what is the purpose of frame-relay LMI？
参考答案：
Local Management Interface
The LMI is used to exchange messages and information on the state of a connection. Using the LMI， both ends of a Frame Relay connection can communicate with each other to determine the status of the PVC， the DLCI value defined for the connection， whether the interface is active and so on.
[单项选择题]
9、What keywords do you need to the access-list to provide to the logging message like source address and source mac address？
（）
A.Log
B.Log-input
C.Log-output
D.Logging
参考答案：
B
[单项选择题]
10、What are the mandatory，well-known BGP attributes？
（）
A.origin，AS-path，next-hop
B.AS-path，origin，MED
C.AS-path，origin，weight
D.AS-path，weight，MED
参考答案：
A
[多项选择题]
11、In your Cisco EIGRP network，you notice that the neighbor relationship between two of your routers was recently restarted. Which two of these choices could have made this occur？
（）
A.An update packet with init flag set from a known， already established neighbor relationship was received by one of the routers.
B.The ARP cache was cleared.
C.The counters were cleared.
D.The IP EIGRP neighbor relationship was cleared manually.
参考答案：
A,D
[单项选择题]
12、Which RMON group stores statistics for conversations between sets of two addresses？
（）
A.hostTopN
B.matrix
C.statistics
D.history
E.packet capture
F.host
参考答案：
B
[单项选择题]
13、Refer to the exhibit. Based on the configuration shown, which queuing mechanism has been configured on interface serial 1/0?
（）
A.PQ
B.CQ
C.WFQ
D.LLQ
E.CBWFQ
参考答案：
E
[多项选择题]
14、Refer to the exhibit. A network engineer received a sudden request to prioritize voice over his Cisco network and he has decided to leverage the AutoQoS feature. Based on the output shown, which two tasks need to be performed prior to issuing the autoqos voip command in this router?
（）
A.Enable Cisco Express Forwarding.
B.Enable fast switching.
C.Delete all policy maps.
D.Remove service-policy commands from interface serial1/0.
E.Delete all the currently configured class maps.
参考答案：
A,D
[填空题]
15NTP怎么度量距离可靠源的距离？
参考答案：
NTP uses the concept of a “stratum” to describe how many NTP “hops” away a machine is from an authoritative time source.
[填空题]
16what is IOS feature limit or controls traffic on a catalyst interface？
参考答案：
storm contol
[多项选择题]
17、Refer to the exhibit. According to the output of the command show tag-switching forwarding-table, which four of these statements are true?
（）
A.Packets to the IP address 10.10.10.5/32 will be tagged with "17" toward the next hop.
B.Label "19" will be advertised to MPLS neighbors so that they can use this label to reach the IP address 10.10.10.6/32.
C.IP address 10.10.10.4/32 is directly connected to the neighbor router on serial 3/0.
D.Packets arriving with label "17" will be forwarded without any label toward serial 4/0.
E.Packets arriving with label "20" will be forwarded with label "21" after label-swapping.
F.Label "20" is advertised to MPLS neighbors so that they can use this information to reach the prefix 10.10.10.8/32.
参考答案：
C,D,E,F
[单项选择题]
18、While troubleshooting a network， you need to verify the liveness of hosts in the subnet 192.168.1.64/26. All of the hosts are able to reply to ping requests. How would you confirm the existing nodes using one single command？
（）
A.ping 192.168.1.255
B.ping with sweep option
C.ping 192.168.1.127
D.ping 192.168.1.64
E.ping with broadcast option
参考答案：
C
[填空题]
19什么环境下需要用组播？
参考答案：
When the source is sending traffic to a group of receivers and bandwidth-conserving is required， multicast is used.
[单项选择题]
20、What is the default maximum reservable bandwidth （percentage） by any single flow on an interface after enabling RSVP？
（）
A.75 percent
B.60 percent
C.56 percent
D.50 percent
E.25 percent
参考答案：
A
[填空题]
21网络安全涉及到TCP/IP哪几层？
参考答案：
Layer 1 （Network interface Layer ），Layer 2 （Internet Layer），layer 3 （Transport Layer），Layer 4 （Application Layer）。
更多内容请访问《睦霖题库》微信公众号
[单项选择题]
22、What is an important consideration that should be taken into account when configuring shaped round robin？
（）
A.It enables policing.
B.Strict priority is not supported.
C.WRED must be previously enabled.
D.It enables WRR
参考答案：
B
[单项选择题]
23、Before inserting a new switch in the network，the network administrator checks that the VTP domain name is correct，the VTP mode is set to server， and revision is lower than the switches in the network. The administrator then configures interfaces and trunks，erases existing VLANs，and connects the switch to the network. Following that procedure，there is no connectivity in the network. What is a possible cause of this problem？
（）
A.Because the configuration revision of the new switches is lower than the rest of the network， it can change the VLAN database of the other switches.
B.As a VTP server， the new switch deleted all VLANs of the network.
C.Erasing VLANs increases the VTP configuration revision.
D.Since the configuration revision of the network is higher than the new switch， the VLAN database was automatically synchronized.
参考答案：
C
[填空题]
24what is the advantage of policing？
参考答案：
（1）bandwidth management through rate-limiting.
（2）packet marking through ip precedence， QOS group， DSCP value setting.
[填空题]
25frame-raley pvc static状态由于什么原因引起？
参考答案：
STATIC –LMI is disabled. It may be the “no keepalive” command configued on the interface.
[填空题]
26OSPF的域间路由通告行为？
问R1能够将AREA 1通告给AREA 0的域间路由在通告回AREA 1吗？
为什么？
参考答案：
NO. This distance vector behavior prevent R1 advertise routes learn from area 1 back to area 1.
According to RFC 2328，there is a rule equivalent of a Distance Vector protocol’s split horizon logic.The rule is described as below：
before ABR advertises a summary LSAs（including type 3 and type 4 LSA） to a attached area， if the next hop of the route in the routing table entry belong to the area itself， do not generate a summary-LSA for the route.
[单项选择题]
27、Refer to exhibits 1 and 2. A company uses a Metro Ethernet （Gigabit Ethernet） dedicated circuit to communicate between users （subnet B） and servers （subnet A） as shown in Exhibit 1. Both routers use OSPF to advertise the subnets. During a weekly management meeting， they realize that the WAN link is oversize. They have been using only 2 Mb/s in the worst-case scenario. So they propose a new， cheaper WAN connection using a 2-Mb/s Frame-Relay point-to-point link to interconnect both sites （Exhibit 2）. The Frame Relay service provider informs them that multicast traffic is not allowed to run over the service provider network. Which one of these options is best to enable the company to establish the OSPF neighbor adjacency？
（）
A.Use OSPF network broadcast，because it uses unicast to establish a neighbor relationship.
B.Use OSPF network point-to-multipoint，because it uses unicast to establish a neighbor relationship.
C.Use OSPF network point-to-point，because it uses unicast to establish a neighbor relationship.
D.Use OSPF network point-to-multipoint nonbroadcast，because it establishes a neighbor relationship using unicast packets.
E.Use OSPF network nonbroadcast，because it establishes a neighbor relationship using multicast.
参考答案：
D
[单项选择题]
28、Refer to exhibits 1 and 2. In exhibit 1，all users on the LAN segment use router A as the active HSRP router. Router B is the standby router for the HSRP. In exhibit 2，the network management team reported that there is no utilization on the WAN link B. To solve this problem，you decide to change the logical topology of your LAN，but you are not sure about what changes must be made. You must manage HSRP or change it to another protocol in order to provide the most scalable design，automatic redundancy，and load balancing. Which one of these actions would be the best choice？
（）
A.Use MHSRP，with three users using router A as the default gateway and three users using router B as the default gateway.
B.Keep HSRP and activate PBR to redirect half of the traffic to the other WAN link.
C.Use the backup interface on the WAN link B to provide load balancing for all users.
D.Use GLBP instead，because it provides you with up to three MAC addresses for the same default gateway virtual IP address.
E.Use GLBP instead，because it provides you with up to four MAC addresses for the same default gateway virtual IP address.
参考答案：
E
[多项选择题]
29、Your company is researching a new application that runs over IPv6，but part of it must still have IPv4 support. Your company uses a traditional IPv4 network. Your plan is not to run IPv6 over the w
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