Alerte nouveaux produits et prix
Type d'alerte:
×
We're Hiring
Join Our Global Supplier Network. Join us and expand your business with premium IT hardware!

LISTE DE PRIX VMWARE 2024

Le meilleur outil de vérification de la liste de prix des produits Vmware Business
Ordinateur portable, tablette, ordinateur de bureau ou serveur VMware

Partenaire avec Router-switch.com

Rejoignez une communauté informatique conçue pour favoriser la croissance des entreprises.

Besoin d'aide pour? Nous sommes heureux de répondre à vos questions.
#Non Produit La description Liste des prix (USD) Notre prix   Citation
101 CF4-B3-ENT-AD-C-T1 Customer Purchasing Program T1 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,720.25         Citation
102 CF4-ENT-A Academic VMware Cloud Foundation 4 Enterprise (Per CPU). $14,697.00         Citation
103 CF4-B2-ENT-AD-F-L1 TPP L1 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,530.25         Citation
104 CF4-B2-ENT-AD-C-T1 Customer Purchasing Program T1 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,530.25         Citation
105 CF4-B3-ENT-AD-F-L2 TPP L2 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,410.35         Citation
106 CF4-B3-ENT-AD-C-T2 Customer Purchasing Program T2 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,410.35         Citation
107 CF-ENT-A Academic VMware Cloud Foundation Enterprise (Per CPU). $14,397.00         Citation
108 CF-B3-VS6-ENT-C Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $14,335.00         Citation
109 CF4-ENT-ES-TZ-1Y-A Academic VMware Cloud Foundation 4 Enterprise for External Storage with 1-Year Tanzu (Per CPU). $14,250.00         Citation
110 CF-B4-VS6-ENT-C-L1 VPP L1 Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $14,232.00         Citation
111 CF4-B2-ENT-AD-F-L2 TPP L2 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,224.35         Citation
112 CF4-B2-ENT-AD-C-T2 Customer Purchasing Program T2 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $14,224.35         Citation
113 CF4-B3-ENT-AD-F-L3 TPP L3 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,945.50         Citation
114 CF4-B3-ENT-AD-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,945.50         Citation
115 CF-B4-VS6-ENT-C-L2 VPP L2 Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $13,935.50         Citation
116 CF4-B1-ENT-ES-AD-3P-SSS-A Academic Production Support/Subscription for Add on to VMware vSphere 7 to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $13,788.72         Citation
117 CF4-B1-ENT-ES-AD-3P-SSS-F U.S. Federal Production Support/Subscription for Add on to VMware vSphere 7 to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $13,788.72         Citation
118 CF4-B1-ENT-ES-AD-3P-SSS-C Production Support/Subscription for Add on to VMware vSphere 7 to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $13,788.72         Citation
119 CF4-B2-ENT-AD-F-L3 TPP L3 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,765.50         Citation
120 CF4-B2-ENT-AD-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,765.50         Citation
121 CF-B3-VS6-ENT-C-L1 VPP L1 Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $13,761.60         Citation
122 CF4-B3-ENT-AD-C-L4 VPP L4 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,635.60         Citation
123 CF4-ENT-ES-A Academic VMware Cloud Foundation 4 Enterprise (Per CPU). $13,497.00         Citation
124 CF-B4-VS6-ENT-C-L3 VPP L3 Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $13,490.75         Citation
125 CF4-B3-ENT-AD-F-L4 TPP L4 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,480.65         Citation
126 CF-B3-VS6-ENT-C-L2 VPP L2 Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $13,474.90         Citation
127 CF4-B2-ENT-AD-C-L4 VPP L4 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,459.60         Citation
128 CF4-B1-ENT-AD-A Academic Add on to VMware vSphere 7 to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,437.00         Citation
129 CF-B4-VS6-ENT-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $13,342.50         Citation
130 CF4-B2-ENT-AD-F-L4 TPP L4 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $13,306.65         Citation
131 CF-B1-VS6-ENT-A Academic Add on to VMware vSphere 6 to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $13,137.00         Citation
132 CF-B4-VS6-ENT-C-L4 VPP L4 Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $13,046.00         Citation
133 CF-B3-VS6-ENT-C-L3 VPP L3 Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $13,044.85         Citation
134 CF-B3-VS6-ENT-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $12,901.50         Citation
135 CF-B3-VS6-ENT-C-L4 VPP L4 Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) - For existing VPP customers only. $12,614.80         Citation
136 CF-B2-VS6-ENT-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 6 and VMware vSAN 6) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) for 3 years. $12,490.50         Citation
137 CF-B2-VS6-ENT-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 6 and VMware vSAN 6) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) for 3 years. $12,490.50         Citation
138 CF4-B3-ENT-ES-AD-F U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,995.00         Citation
139 CF4-B3-ENT-ES-AD-C Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,995.00         Citation
140 CF4-B2-ENT-ES-AD-F U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,895.00         Citation
141 CF4-B2-ENT-ES-AD-C Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,895.00         Citation
142 CF4-B1-ENT-ES-AD-A Academic Add on to VMware vSphere 7 to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,757.00         Citation
143 CF4-B3-ENT-ES-AD-F-L1 TPP L1 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,395.25         Citation
144 CF4-B3-ENT-ES-AD-C-T1 Customer Purchasing Program T1 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $11,395.25         Citation
145 CF4-B2-ENT-ES-AD-F-L1 TPP L1 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,300.25         Citation
146 CF4-B2-ENT-ES-AD-C-T1 Customer Purchasing Program T1 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $11,300.25         Citation
147 CF4-B3-ENT-ES-AD-F-L2 TPP L2 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,155.35         Citation
148 CF4-B3-ENT-ES-AD-C-T2 Customer Purchasing Program T2 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $11,155.35         Citation
149 CF4-B2-ENT-ES-AD-F-L2 TPP L2 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $11,062.35         Citation
150 CF4-B2-ENT-ES-AD-C-T2 Customer Purchasing Program T2 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $11,062.35         Citation
151 CF4-B3-ENT-AD-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $10,982.40         Citation
152 CF4-B3-ENT-AD-3P-SSS-F U.S. Federal Production Support/Subscription for Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $10,982.40         Citation
153 CF4-B3-ENT-AD-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $10,982.40         Citation
154 CF-B4-VS6-ENT-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) for 3 years. $10,979.10         Citation
155 CF-B4-VS6-ENT-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) for 3 years. $10,979.10         Citation
156 CF4-B2-ENT-AD-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $10,882.08         Citation
157 CF4-B2-ENT-AD-3P-SSS-F U.S. Federal Production Support/Subscription for Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $10,882.08         Citation
158 CF4-B2-ENT-AD-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $10,882.08         Citation
159 CF4-B3-ENT-ES-AD-F-L3 TPP L3 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $10,795.50         Citation
160 CF4-B3-ENT-ES-AD-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $10,795.50         Citation
161 CF4-B2-ENT-ES-AD-F-L3 TPP L3 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $10,705.50         Citation
162 CF4-B2-ENT-ES-AD-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $10,705.50         Citation
163 CF-B3-VS6-ENT-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) for 3 years. $10,616.10         Citation
164 CF-B3-VS6-ENT-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU) for 3 years. $10,616.10         Citation
165 CF4-B3-ENT-ES-AD-C-L4 VPP L4 Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $10,555.60         Citation
166 CF4-B2-ENT-ES-AD-C-L4 VPP L4 Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack for External Storage (Per CPU). $10,467.60         Citation
167 CF4-B3-ENT-ES-AD-F-L4 TPP L4 U.S. Federal Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $10,435.65         Citation
168 CF4-B2-ENT-ES-AD-F-L4 TPP L4 U.S. Federal Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $10,348.65         Citation
169 CF-B2-VS6-ENT-A Academic Add on to (VMware vSphere 6 and VMware vSAN 6) to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $10,119.00         Citation
170 CF4-B3-ENT-AD-A Academic Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $9,297.00         Citation
171 CF4-B2-ENT-AD-A Academic Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $9,177.00         Citation
172 CF-B4-VS6-ENT-A Academic Add on to (VMware vSphere 6 and vRealize Suite 2017) to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $8,895.00         Citation
173 CF-B3-VS6-ENT-A Academic Add on to (VMware vSphere 6 and VMware NSX) to complete VMware Cloud Foundation Enterprise Stack (Per CPU). $8,601.00         Citation
174 CF4-B3-ENT-ES-AD-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $8,281.68         Citation
175 CF4-B3-ENT-ES-AD-3P-SSS-F U.S. Federal Production Support/Subscription for Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $8,281.68         Citation
176 CF4-B3-ENT-ES-AD-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $8,281.68         Citation
177 CF4-B2-ENT-ES-AD-3P-SSS-A Academic Production Support/Subscription for Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $8,181.36         Citation
178 CF4-B2-ENT-ES-AD-3P-SSS-F U.S. Federal Production Support/Subscription for Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $8,181.36         Citation
179 CF4-B2-ENT-ES-AD-3P-SSS-C Production Support/Subscription for Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU) for 3 years. $8,181.36         Citation
180 CF4-B4-ENT-AD-F U.S. Federal Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $8,140.00         Citation
181 CF4-B4-ENT-AD-C Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $8,140.00         Citation
182 CF4-B4-ENT-AD-F-L1 TPP L1 U.S. Federal Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,733.00         Citation
183 CF4-B4-ENT-AD-C-T1 Customer Purchasing Program T1 Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,733.00         Citation
184 CF4-B4-ENT-AD-F-L2 TPP L2 U.S. Federal Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,570.20         Citation
185 CF4-B4-ENT-AD-C-T2 Customer Purchasing Program T2 Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,570.20         Citation
186 CF4-B4-ENT-AD-F-L3 TPP L3 U.S. Federal Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,326.00         Citation
187 CF4-B4-ENT-AD-C-T3 Customer Purchasing Program T3 Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,326.00         Citation
188 CF4-B3-ENT-ES-AD-A Academic Add on to (VMware vSphere 7 and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,197.00         Citation
189 CF4-B4-ENT-AD-C-L4 VPP L4 Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,163.20         Citation
190 CF4-ENT-P-SSS-A Academic Production Support/Subscription for VMware Cloud Foundation 4 Enterprise (Per CPU) for 1 year. $7,145.00         Citation
191 CF4-ENT-P-SSS-F U.S. Federal Production Support/Subscription for VMware Cloud Foundation 4 Enterprise (Per CPU) for 1 year. $7,145.00         Citation
192 CF4-ENT-P-SSS-C Production Support/Subscription for VMware Cloud Foundation 4 Enterprise (Per CPU) for 1 year. $7,145.00         Citation
193 CF4-ENT-TZ-1Y-P-SSS-A Academic Production Support/Subscription for VMware Cloud Foundation 4 Enterprise with 1-Year Tanzu (Per CPU) for 1 year. $7,145.00         Citation
194 CF4-ENT-TZ-1Y-P-SSS-C Production Support/Subscription for VMware Cloud Foundation 4 Enterprise with 1-Year Tanzu (Per CPU) for 1 year. $7,145.00         Citation
195 CF4-ENT-TZ-3Y-P-SSS-A Academic Production Support/Subscription for VMware Cloud Foundation 4 Enterprise with 3-Year Tanzu (Per CPU) for 1 year. $7,145.00         Citation
196 CF4-ENT-TZ-3Y-P-SSS-C Production Support/Subscription for VMware Cloud Foundation 4 Enterprise with 3-Year Tanzu (Per CPU) for 1 year. $7,145.00         Citation
197 CF4-ENT-TZ-1Y-P-SSS-F U.S. Federal Production Support/Subscription for VMware Cloud Foundation 4 Enterprise with 1-Year Tanzu (Per CPU) for 1 year. $7,145.00         Citation
198 CF4-ENT-TZ-3Y-P-SSS-F U.S. Federal Production Support/Subscription for VMware Cloud Foundation 4 Enterprise with 3-Year Tanzu (Per CPU) for 1 year. $7,145.00         Citation
199 CF4-B2-ENT-ES-AD-A Academic Add on to (VMware vSphere 7 and VMware NSX) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,137.00         Citation
200 CF4-B4-ENT-AD-F-L4 TPP L4 U.S. Federal Add on to (VMware vSphere 7, VMware NSX, and vRealize Suite 2019) to complete VMware Cloud Foundation 4 Enterprise Stack (Per CPU). $7,081.80         Citation
×
Our Technical Experts Groups
David
Ward
Networking Expert
Jason
Lee
Security Expert
Stephen
Speirs
Storage Expert
Eric
Tsang
Data Center Expert