希赛网为大家整理了2017上半年网络工程师考试上午真题,以下为第八部分。
下图为某公司网络管理员规划的新办公大楼网络拓扑图,针对该网络规划,以下说法中不合理的是(69)

A.核心交换机之间可以采用VRRP、虚拟化等技术手段
B.网络内各VLAN之间访问需要经过两台核心交换设备中的一台
C.接入交换机多采用三层交换机
D.网络拓扑结构可靠
在对网络设备巡检中,检测到交换机端口有大量的CRC错包,结合错包呈现出不断上涨的趋势,下面故障原因中,不可能的是(70)

A.端口状态异常
B.物理链路故障
C.电磁干扰
D.病毒攻击
If two communicating entities are in different hosts connected by a network,there is a risk that PDUs will not arrive in the order in which they were sent,because they may traverse(71)paths through the network.If each PDUs is given a unique number,and numbers are assigned(72),then it is a logically simple task for the receiving entity to reorder(73)PDUs on the basis of sequence number.A problem with this scheme is that,with a(74)sequence number field,sequence number will repeat.Evidently,the maximum sequence number must be(75)than the maximum number of PDUs that could be outstanding at any time.
A.same
B.different
C.single
D.Unique
A.randomly
B.equally
C.uniformly
D.Sequentially
A.received
B.sent
C.transmitting
D.Forwarding
A.various
B.diverse
C.finite
D.infinite
A.smaller
B.greater
C.less
D.More
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